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NCERT Solutions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes

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NCERT Solutions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes

Edited By Irshad Anwar | Updated on Mar 06, 2023 02:58 PM IST | #CBSE Class 12th

NCERT Solutions for Class 12 Chemistry chapter 10 Haloalkanes and Haloarenes - We all know about the periodic table and its elements. So, ever wondered that from these elements how Haloalkanes and Halaorenes are actually formed? When a hydrogen atom is replaced by a halogen atom (F, Cl, Br, I) in an aliphatic hydrocarbon it results in formation of Haloalkane or alkane halide. The same goes for Haloarenes, when a hydrogen atom is replaced by a halogen in an aromatic hydrocarbon then it forms Haloarene or aryl halide. These haloalkanes and haloarenes ncert solutions will help in understanding concepts of Haloalkanes and Haloarenes. These haloalkanes and haloarenes class 12 chapter 10 are explained by experts in the easiest way. This will help to resolve all NCERT problems of this chapter.

NCERT Solutions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes
NCERT Solutions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes

Also Read : Haloalkanes and Haloarenes Class 12 Notes

Topics and Sub-topics of NCERT Solutions for Class 12 Chemistry chapter 10 Haloalkanes and Haloarenes-

Class 12 chemistry ch 10 ncert solutions important topics and subtopics are given below:

10.1 Classification

10.2 Nomenclature

10.3 Nature of C–X Bond

10.4 Methods of Preparation of Haloalkanes

10.5 Preparation of Haloarenes

10.6 Physical Properties

10.7 Chemical Reactions

Find NCERT Solutions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes below:

Solutions to In-Text Questions Ex 10.1 to 10.9

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Question 1 Write structures of the following compounds:

(i) 2-Chloro-3-methylpentane

Answer :

The structure of 2-Chloro-3-methylpentane is given below :-

1650393268093

Question 10.1 Write structures of the following compounds:

(ii) 1-Chloro-4-ethylcyclohexane

Answer :

The structure of 1-Chloro-4-ethylcyclohexane is given below :-

1650393304836


Question 10.1 Write structures of the following compounds:

(iii) 4-tert. Butyl-3-iodoheptane

Answer :

The structure of 4-tert. Butyl-3-iodoheptane is given below :-

1650393334343


Question 10.1 Write structures of the following compounds:

(iv) 1,4-Dibromobut-2-ene

Answer :

The structure of 1,4-Dibromobut-2-ene is given below :-

1650393521544

Question 10.1 Write structures of the following compounds:

(v) 1-Bromo-4-sec. butyl-2-methylbenzene

Answer :

The structure of 1-Bromo-4-sec. butyl-2-methylbenzene is shown below :-

1650393588711

Question 10.2 Why is sulphuric acid not used during the reaction of alcohols with KI?

Answer :

We don't use sulphuric acid because it acts as an oxidising agent and the required alkyl iodide is not produced. The reactions are given below :-

2KI + H 2 SO 4 → 2KHSO 4 + 2HI

2HI + H 2 SO 4 → I 2 + SO 2 + H 2 O

Question 10.3 Write structures of different dihalogen derivatives of propane.

Answer :

We obtain four dihalogen derivatives of propane :-

(i) 1,1 Dibromopropane

1650393649596

(ii) 2, 2 Dibromopropane

1650393673880

(iii) 1, 2 Dibromopropane

1650393696576

(iv) 1, 3 Dibromopropane

1650393717664

Question 10.4 Among the isomeric alkanes of molecular formula C 5 H 12 , identify the one that on photochemical chlorination yields

(i) A single monochloride

Answer :

In this we have to find an isomer in which replacement of any hydrogen atom gives the singel compound for all replacements.

So the isomer is Neopentane.

1650393974824

Question 10.4 Among the isomeric alkanes of molecular formula C 5 H 12 , identify the one that on photochemical chlorination yields

(ii) Three isomeric monochlorides.

Answer :

For the given condition we must have three different hydrogens so that we can get three different monochlorides on the replacement.

Thus the isomer is n-pentane.

1650394033275

Question 10.4 Among the isomeric alkanes of molecular formula C 5 H 12 , identify the one that on photochemical chlorination yields

(iii) Four isomeric monochlorides .

Answer :

For four monochlorides we need four different hydrogens which can be replaced by chlorine.

Hence the required isomer is :-

Question 10.6 Arrange each set of compounds in order of increasing boiling points.

(i) Bromomethane, Bromoform, Chloromethane, Dibromomethane.

Answer :

It is known that boiling point increases with increase in molecular mass when the alkyl group is the same.

So the order of increasing boiling point is Chloromethane < Bromomethane < Dibromomethane < Bromoform


Question 10.6 Arrange each set of compounds in order of increasing boiling points.

(ii) 1-Chloropropane, Isopropyl chloride, 1-Chlorobutane.

Answer :

In the given compounds the halide groups are same. In these cases, the boiling point depends on the bulkiness of the alkyl group. The boiling point increases with an increase in the chain length. Also, the boiling point decreases with an increase in branching.

So the order is :- 1- Chlorobutane > 1- Chloropropane > Isopropyl Chloride


Question 10.7 Which alkyl halide from the following pairs would you expect to react more rapidly by an S_{N}2 mechanism? Explain your answer.

CH_{3}CH_{2}CH_{2}CH_{2}Br

Answer :

In this case, the rate of S_{N}2 reaction will depend on the hindrance of the substrate.

Since 1- Bromobutane is a 1^{\circ} alkyl halide and 2- Bromobutane is a 2^{\circ} alkyl halide hence 2- Bromobutane gives more hindrance to the nucleophile.

Hence 1- Bromobutane reacts faster.


Question 10.7 Which alkyl halide from the following pairs would you expect to react more rapidly by an S_{N}2 mechanism? Explain your answer.

1650394520742

Answer :

The rate of S_{N}2 reaction decreases with increase in hindrance to the attack of the nucleophile.

So 2-bromobutane will react faster than 2-bromo-2-methylpropane in the nucleophilic attack.


Question 10.7 Which alkyl halide from the following pairs would you expect to react more rapidly by an S_{N}2 mechanism? Explain your answer.

1650394551180

Answer :

In these kinds of cases, we see where is the substituent is attached i.e., how far from the halide group. It can be clearly seen that the methyl group attached in 1-bromo-2-methylbutane is near than that attached in 1-bromo-3-methyl butane.

Hence the rate of S_{N}2 reaction will be faster in case of 1-bromo-3-methylbutane.


Question 10.8 In the following pairs of halogen compounds, which compound undergoes faster S_{N}1 reaction?

(i) 1650394593342

Answer :

In S_{N}1 reactions, we see the formation of carbocation and this is the rate determining step for this kind of reactions. So the compound having more stable carbocation will react faster. In the given case 2- Chloro, 2- Methylpropane we have 3^{\circ} carbon whereas in 3- Chloropentane we have 2^{\circ} carbon.


Question 10.8 In the following pairs of halogen compounds, which compound undergoes faster S_{N}1 reaction?

1650394629230

Answer :

In S_{N}1 reactions, we see the formation of carbocation and this is the rate determining step for these kinds of reactions.So the compound having more stable carbocation will react faster. Hence 2-Chloroheptane will react faster than 1- Chlorohexane.


Question 10.9 Identify A, B, C, D, E, R and R1 in the following:

1650394661923

Answer :

1st reaction :-

1650394679729

2nd reaction :-

1650394698219

3rd reaction :-

1650394715385

NCERT Solutions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes- Exercise Questions

Question 10.1 Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

(i) \left ( CH_{3} \right )_{2}CHCH (Cl)CH_{3}

Answer :

(i) 2-Chloro-3-methylbutane. And it is a secondary alkyl halide.


Question 10.1 Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

(iv) (CH_{3})_{3}CCH_{2}CH(Br)C_{6}H_{5}

Answer :

(iv) 1-Bromo-3, 3-dimethyl-1-phenylbutane. And it is secondary benzyl halide.


Question 10.1 Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

(xi) m- Cl C_{6}H_{4}CH_{2}CH (CH_{3})_{2}

Answer :

(xi) 1-Chloromethyl-3-(2, 2-dimethylpropyl) benzene. And it is primary benzyl halide.

Question 10.2 Give the IUPAC names of the following compounds:

(i) CH_{3}CH(Cl)CH (Br)CH_{3}

Answer :

(i) 2-Bromo-3-chlorobutane

Question 10.2 Give the IUPAC names of the following compounds:

(ii) CHF_{2}CBrCIF

Answer :

1-Bromo-1-chloro-1, 2, 2-trifluroethane

Question 10.2 Give the IUPAC names of the following compounds:

(iii) Cl CH_{2}C \equiv C CH_{2}Br

Answer :

1-Bromo-4-chlorobut-2-yne

Question 10.2 Give the IUPAC names of the following compounds:

(iv) (CCl_{3})_{3}CCl

Answer :

2-(Trichloromethyl)-1, 1, 1, 2, 3, 3, 3-heptachloropropane

Question 10.2 Give the IUPAC names of the following compounds:

(v) CH_{3}(p- Cl C_{6}H_{4})_{2}CH(Br)CH_{3}

Answer :

2-Bromo-3, 3-bis(4-Chlorophenyl) butane

Question 10.2 Give the IUPAC names of the following compounds:

(vi) (CH_{3})_{3}CCH = CCl C_{6}H_{4}I - p

Answer :

1-Chloro-1-(4-iodophenyl)-3, 3-dimethylbut-1-ene

Question 10.3 Write the structures of the following organic halogen compounds.

(i) 2-Chloro-3-methylpentane

Answer :

(i)

1650394770185

Question 10.3 Write the structures of the following organic halogen compounds.

(ii) p-Bromochlorobenzene

Answer :

(ii)

1650394830725

Question 10.3 Write the structures of the following organic halogen compounds.

(iii) 1-Chloro-4-ethylcyclohexane

Answer :

(iii)

1650394865688

Question 10.3 Write the structures of the following organic halogen compounds.

(iv) 2-(2-Chlorophenyl)-1-iodooctane

Answer :

(iv)

1650394905647

Question 10.3 Write the structures of the following organic halogen compounds.

(v) 2-Bromobutane

Answer :

(v)

1650394945214

Question 10.3 Write the structures of the following organic halogen compounds.

(vi) 4-tert-Butyl-3-iodoheptane

Answer :

(vi)

1650394997618

Question 10.3 Write the structures of the following organic halogen compounds.

(vii) 1-Bromo-4-sec-butyl-2-methylbenzene

Answer :

(vii)

1650395035475

Question 10.3 Write the structures of the following organic halogen compounds.

(viii) 1,4-Dibromobut-2-ene

Answer :

(viii)

1650395068985

Question 10.4 Which one of the following has the highest dipole moment?

(i) CH 2 Cl 2 (ii) CHCl 3 (iii) CCl 4

Answer :

The order of dipole moment will be :- CH 2 Cl 2 > CHCl 3 > CCl 4.

The reason for the above order is given as- CCl 4 is a symmetrical compound so its dipole moment will be zero. In case of CHCl 3 , one of the Cl cancels dipole moment of the opposite Cl atom, so net dipole moment is just due to one Cl. In the case of CH 2 Cl 2 , both Cl groups contribute to the dipole moment so it has the highest dipole moment among all.

Question 10.5 A hydrocarbon C 5 H 10 does not react with chlorine in dark but gives a single monochloro compound C 5 H 9 Cl in bright sunlight. Identify the hydrocarbon.

Answer :

We are given the formula C 5 H 10 which can be either of an alkene or of cycloalkane. Since the hydrocarbon doesn't react with chlorine in dark thus it cannot be alkene. So the only option left out is cyclopentane.

1650395110987

Question 10.6 Write the isomers of the compound having formula C_{4}H_{9}Br .

Answer :

The isomers of the compound C_{4}H_{9}Br are :-

(i) 1-Bromobutane

1650395155565

(ii) 2-Bromobutane

1650395182967

(iii) 1-Bromo-2-methylpropane

1650395202259

(iv) 2-Bromo-2-methylpropane

1650395222249

Question 10.7 Write the equations for the preparation of 1-iodobutane from:

(i) 1-butanol

Answer :

(i) The procedure given below can be used :-

1650395262688

Question 10.7 Write the equations for the preparation of 1-iodobutane from

(ii) 1-chlorobutane

Answer :

(ii) The required product can be obtained as shown below :-

1650395301827

Question 10.7 Write the equations for the preparation of 1-iodobutane from

(iii) but-1-ene

Answer :

(iii) The required product is obtained by following procedure :-

1650395383932

Question 10.8 What are ambident nucleophiles? Explain with an example.

Answer :

The ambident nucleophiles are those nucleophiles which have two nucleophilic sites through which they can attack. For e.g Nitrile ion can attack through both nitrogen atom (forms nitroalkanes) and an oxygen atom (forms alkyl nitrites), thus it is an ambident nucleophile.


Question 10.9 Which compound in each of the following pairs will react faster in S N 2 reaction with –OH?

(i) CH 3 Br or CH 3 I

Answer :

In this case, we have the same alkyl group but different halide ions. For this rate of S N 2 reaction increases with increase in atomic mass. So, CH 3 I will react faster than CH 3 Br.


Question 10.9 Which compound in each of the following pairs will react faster in S N 2 reaction with –OH?

(ii) (CH_{3})_{3}CCl or CH_{3}Cl

Answer :

In this case, the hindrance will be deciding factor for the rate of S N 2 reaction because hindrance will directly affect the attack of the nucleophile. So CH_{3}Cl will react faster as compared to (CH_{3})_{3}CCl .

Question 10.10 Predict all the alkenes that would be formed by dehydrohalogenation of the following halides with sodium ethoxide in ethanol and identify the major alkene:

(i) 1-Bromo-1-methylcyclohexane

Answer :

1650395452626

In this compound, it is clear that we have identical \beta hydrogen, therefore, dehalogenation of the given compound gives the same alkene.

1650395489418

Question 10.10 Predict all the alkenes that would be formed by dehydrohalogenation of the following halides with sodium ethoxide in ethanol and identify the major alkene:

(ii) 2-Chloro-2-methylbutane

Answer :

(ii)

1650395539877

In this compound we have two kind of \beta hydrogen. So dehalogenation will give two kind of alkenes, namely 2-Methylbut-2-ene and 2-Methylbut-1-ene.

15949131170821594913112687

The major product of this reaction will be 2-Methylbut-2-ene as the number of \alpha - hydrogens attached to double bonded carbon are more in case of this compound.

Question 10.10 Predict all the alkenes that would be formed by dehydrohalogenation of the following halides with sodium ethoxide in ethanol and identify the major alkene:

(iii) 2,2,3-Trimethyl-3-bromopentane

Answer :

(iii)

1650395582853

In this compound we have two type of \beta - hydrogen thus dehalogenation we get two types of products namely 3, 4, 4-Trimethylpent-2-ene and 2-Ethyl-3,3-dimethylbut-2-ene.

1650395602563 and 1650395617100

Here 3, 4, 4-Trimethylpent-2-ene will be major product, since the \alpha - hydrogen attached to the double bond are greater.

Question 10.11 How will you bring about the following conversions?

(i) Ethanol to but-1-yne

Answer :

(i) The conversion will take place by following procedure :-

1650395649100

Now,

1650395667267

1650395692814

Question 10.11 How will you bring about the following conversions?

(ii) Ethane to bromoethene

Answer :

(ii)

1650395734449

Question 10.11 How will you bring about the following conversions?

(iii) Propene to 1-nitropropane

Answer :

(iii)

1650395766265

Question 10.11 How will you bring about the following conversions?

(iv) Toluene to benzyl alcohol

Answer :

(iv)

1650395803620

Question 10.11 How will you bring about the following conversions?

(v) Propene to propyne

Answer :

(v)

1650395841286

Question 10.11 How will you bring about the following conversions?

(vi) Ethanol to ethyl fluoride

Answer :

(vi)

1650395904233

Question 10.11 How will you bring about the following conversions?

(vii) Bromomethane to propanone

Answer :

(vii)

1650395947461

Question 10.11 How will you bring about the following conversions?

(viii) But-1-ene to but-2-ene

Answer :

(viii)

1650396011008

Question 10.11 How will you bring about the following conversions?

(ix) 1-Chlorobutane to n-octane

Answer :

(ix)

1650396049768

Question 10.11 How will you bring about the following conversions?

(x) Benzene to biphenyl.

Answer :

(x)

1650396088832

Question 10.12 Explain why

(i) the dipole moment of chlorobenzene is lower than that of cyclohexyl chloride?

Answer :

We know that the Cl-atom in chlorobenzene is attached to a sp 2 hybridized carbon atom whereas, in cyclohexyl chloride, the Cl-atom is attached to a sp 3 hybridized carbon atom. It is known that sp 2 hybridized carbon has more s-character than sp 3 hybridized carbon atom. Thus, chlorobenzene is more electronegative than cyclohexyl chloride.

Apart from this, the - R effect of the benzene ring of chlorobenzene results in decreasing the electron density of the C - Cl bond near the Cl-atom. And the C - Cl bond in chlorobenzene becomes less polar. Due to these reasons, the dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.


Question 10.12 Explain why

(ii) alkyl halides, though polar, are immiscible with water?

Answer :

For being soluble in the water we have a condition that the solute-water force of attraction must be stronger than the solute-solute and water-water forces of attraction. Alkyl halides are held together by dipole-dipole interactions and there are polar molecules. Similarly, the intermolecular force of attraction present between the water molecules is hydrogen bonding. The new force of attraction after we dissolve solute in water i.e., between the alkyl halides and water molecules is weaker than the alkyl halide-alkyl halide and water-water forces of attraction. That is why alkyl halides (though polar) are immiscible with water.

Question 10.12 Explain why

(iii) Grignard reagents should be prepared under anhydrous conditions?

Answer :

This is done because in presence of moisture, they react to give alkane.

1650396174518

Question 10.13 Give the uses of freon 12, DDT, carbon tetrachloride and iodoform.

Answer :

(i) Freon-12 or dichlorodifluoromethane is generally known as CFC. It is used in refrigerators and air conditioners as a refrigerant. It is also used in body sprays, hair sprays, etc. But it has environmental impacts as it damages the ozone layer.

(ii) DDT or p, p-dichlorodiphenyltrichloroethane is one of the best-known insecticides which was used very widely all over the world. It is very effective against mosquitoes, insects and lice. But it has harmful effects.

(iii) CCl 4 :- It is mostly used for manufacturing refrigerants for refrigerators and air conditioners. It is also used as a solvent in the manufacture of pharmaceutical products. In the early years, carbon tetrachloride was widely used as a cleaning fluid and a fire extinguisher.

(iv) Iodoform was used earlier as an antiseptic. And this antiseptic property of iodoform is due to the liberation of free iodine when it comes in contact with the skin.

Question 10.14 Write the structure of the major organic product in each of the following reactions:

(i) CH_{3}CH_{2}CH_{2}Cl+NaI\xrightarrow[heat]{acetone}

Answer :

(i) The obtained product is :-

CH_{3}CH_{2}CH_{2}Cl+NaI\xrightarrow[heat]{acetone} 18566


Question 10.14 Write the structure of the major organic product in each of the following reactions:

(ii) (CH_{3})_{3}CBr+KOH \xrightarrow[heat]{ethanol}

Answer :

(ii) The obtained product is 2-Methylpropene

15949131416551594913139667


Question 10.14 Write the structure of the major organic product in each of the following reactions:

(iii) CH_{3}CH(Br)CH_{2}CH_{3}+ NaOH \overset{water}{\rightarrow}

Answer :

(iii) The obtained product is Butan-2-ol.

15949131578861594913156062

Question 10.14 Write the structure of the major organic product in each of the following reactions:

(iv) CH_{3}CH_{2}Br+KCN \overset{aq. ethanol}{\rightarrow}

Answer :

(iv) The obtained product is Cyanoethane.

Bromobutane to cyanoethane

Question 10.14 Write the structure of the major organic product in each of the following reactions:

(v) C_{6}H_{5}ONa + C_{2}H_{5}Cl \rightarrow

Answer :

(v) The obtained product is Phenetole.

Sodium phenoxide to phenetole

Question 10.14 Write the structure of the major organic product in each of the following reactions:

(vi) CH_{3}CH_{2}CH_{2}OH+SOCl_{2}\rightarrow

Answer :

(vi) The obtained product is 1-Chloropropane.

1- propanol to 1-Chloropropane

Question 10.14 Write the structure of the major organic product in each of the following reactions:

(vii) CH_{3}CH_{2}CH = CH _{2}+HBr \overset{peroxide}{\rightarrow}

Answer :

(vii) The obtained product is 1-Bromobutane.

But-1-ene to 1-bromobutane

Question 10.14 Write the structure of the major organic product in each of the following reactions:

(viii) CH_{3}CH = C(CH_{3})_{2}+ HBr \rightarrow

Answer :

The obtained product is 2-Bromo-2-methylbutane.

1650396358369

Question 10.15 Write the mechanism of the following reaction:

nBuBr + KCN \overset{EtOH -H_{2}O}{\rightarrow} nB_{4}CN

Answer :

The reaction will proceed through S N 2 mechanism. The mechanism for the given reaction is shown below :-

1650396425250

Question 10.16 Arrange the compounds of each set in order of reactivity towards S N 2 displacement:

(i) 2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane

Answer :

(i) Here the deciding factor the rate of reaction will be a steric hindrance.

1650396424113

It is clear from the above that the order of hindrance is:-

1-Bromopentane < 2-bromopentane < 2-Bromo-2-methylbutane

So the order of rate of reaction will be:-

2-Bromo-2-methylbutane < 2-Bromopentane < 1-Bromopentane

Question 10.16 Arrange the compounds of each set in order of reactivity towards S N 2 displacement:

(ii) 1-Bromo-3-methylbutane, 2-Bromo-2-methylbutane, 2-Bromo-3-methylbutane

Answer :

(ii) In this case, also, the order of the rate of reaction will be decided from the steric hindrance factor.

1650396475386

It is clear from the above that the steric hindrance in 2-Bromo-2-methylbutane highest (note that hindrance of the carbon attached to halide ion is seen). So the order of the rate of reaction is:-

2-Bromo-2-methylbutane < 2-Bromo-3-methylbutane < 1-Bromo-3-methylbutane


Question 10.16 Arrange the compounds of each set in order of reactivity towards S N 2 displacement:

(iii) 1-Bromobutane, 1-Bromo-2,2-dimethylpropane, 1-Bromo-2-methylbutane, 1-Bromo-3-methylbutane.

Answer :

(iii) The steric hindrance is the deciding factor here.

The order of steric hindrance is :-

1-Bromobutane < 1-Bromo-3-methylbutane < 1-Bromo-2-methylbutane< 1-Bromo-2, 2-dimethylpropane

Thus the order of the rate of reaction will be : -

1-Bromo-2, 2-dimethylpropane < 1-Bromo-2-methylbutane < 1-Bromo-3- methylbutane < 1-Bromobutane

Question 10.17 Out of C_{6}H_{5}CH_{2}Cl and C_{6}H_{5}CHCl C_{6}H_{5} , which is more easily hydrolysed by aqueous KOH.

Answer :

Hydrolysis by KOH will take place by the formation of a carbocation in its rate-determining step. So the compound having stable carbocation will hydrolyse faster.

The carbocations of both the compounds are given below:-

1650396510971

It is clear that carbocation of C_{6}H_{5}CHCl C_{6}H_{5} is more stable.

Hence C_{6}H_{5}CHCl C_{6}H_{5} will hydrolyse faster than C_{6}H_{5}CH_{2}Cl .

Question 10.18 p-Dichlorobenzene has higher m.p. than those of o- and m-isomers. Discuss.

Answer :

The structures of o-Dichlorobenzene, m-Dichlorobenzene and p-Dichlorobenzene are given below.

1650396563342 16503965788941650396597407

We can see that p-Dichlorobenzene is a very symmetric structure thus packing of it will be maximum. As a result more and more energy will be required to break bonds (during boiling). Thus boiling point is high for p-Dichlorobenzene.

Question 10.19 How the following conversions can be carried out?

(i) Propene to propan-1-ol


Answer :

The mechanism is given below :-

1650396628364

Question 10.19 How the following conversions can be carried out?

(ii) Ethanol to but-1-yne

Answer :

The reaction mechanism is given below :-

1650396659481

Question 10.19 How the following conversions can be carried out?

(iii) 1-Bromopropane to 2-bromopropane

Answer :

(iii) The mechanism is given below :-

1650396693799

Question 10.19 How the following conversions can be carried out?

(iv) Toluene to benzyl alcohol

Answer :

(iv) The mechanism is given below :-

1650396725677

Question 10.19 How the following conversions can be carried out?

(v) Benzene to 4-bromonitrobenzene

Answer :

The mechanism for the given reaction is as follows :-

1650396774093

Question 10.19 How the following conversions can be carried out?

(vi) Benzyl alcohol to 2-phenylethanoic acid

Answer :

(vi) The mechanism for the reaction is given below :-

1650396805595

Question 10.19 How the following conversions can be carried out?

(vii) Ethanol to propanenitrile

Answer :

(vii) The mechanism of the given reaction reaction is :-

1650396845862

Question 10.19 How the following conversions can be carried out?

(viii) Aniline to chlorobenzene

Answer :

The mechanism of the reaction is given below :-

1650396881053

Question 10.19 How the following conversions can be carried out ?

(ix) 2-Chlorobutane to 3, 4-dimethylhexane

Answer :

(ix) The required mechanism is as follows :-

1650396915499

Question 10.19 How the following conversions can be carried out?

(x) 2-Methyl-1-propene to 2-chloro-2-methylpropane

Answer :

(x) The required mechanism is given below :-

1650396949386

Question 10.19 How the following conversions can be carried out ?

(xi) Ethyl chloride to propanoic acid

Answer :

The mechanism of the given reaction is :-

1650396978762

Question 10.19 How the following conversions can be carried out?

(xii) But-1-ene to n-butyliodide

Answer :

The mechanism is given below :-

1650397010184

Question 10.19 How the following conversions can be carried out?

(xiii) 2-Chloropropane to 1-propanol

Answer :

The mechanism is :-

1650397041445

Question 10.19 How the following conversions can be carried out?

(xiv) Isopropyl alcohol to iodoform

Answer :

(xiv) The proposed mechanism is :-

1650397073455

Question 10.19 How the following conversions can be carried out?

(xv) Chlorobenzene to p-nitrophenol

Answer :

(xv) The required mechanism is given below :-

1650397106405 `

Question 10.19 How the following conversions can be carried out?

(xvi) 2-Bromopropane to 1-bromopropane

Answer :

The mechanism of the reaction is given below :-

1650397139391

Question 10.19 How the following conversions can be carried out?

(xvii) Chloroethane to butane

Answer :

(xvii) The mechanism of the reaction is :-

1650397178117

Question 10.19 How the following conversions can be carried out?

(xviii) Benzene to diphenyl

Answer :

The mechanism for the given reaction is :-

1650397215170

Question 10.19 How the following conversions can be carried out?

(xix) tert-Butyl bromide to isobutyl bromide

Answer :

The mechanism of the given reaction is :-

1650397251052

Question 10.19 How the following conversions can be carried out?

(xx) Aniline to phenylisocyanide

Answer :

The mechanism for the given reaction is as follows :-

1650397282194

Question 10.20 The treatment of alkyl chlorides with aqueous KOH leads to the formation of alcohols but in the presence of alcoholic KOH, alkenes are major products. Explain.

Answer :

In an aqueous solution, KOH almost completely dissociates into OH - ions. We know that OH - ions are strong nucleophile, which leads the alkyl chloride to undergo a reaction to form alcohol. But an alcoholic solution of KOH contains alkoxide (RO - ) ion, which is a strong base. Thus, it can remove hydrogen from the β-carbon of the alkyl chloride and form an alkene. The OH - ion is a weaker base than RO - ion. The basic character of OH - ion decreases in aqueous solution. Therefore, it cannot remove hydrogen from the β-carbon.

1650397317223

1650397335438

Question 10.22 What happens when

(i) n-butyl chloride is treated with alcoholic KOH,

Answer :

When n-butyl chloride is treated with alcoholic KOH the following reaction occurs:-

1650397448020

Question 10.22 What happens when

(ii) bromobenzene is treated with Mg in the presence of dry ether

Answer :

When bromobenzene is treated with Mg in the presence of dry ether the following reaction occurs :-

1650397481230

Question 10.22 What happens when

(iii) chlorobenzene is subjected to hydrolysis

Answer :

The reaction is given below :-

1650397519695

Question 10.22 What happens when

(iv) ethyl chloride is treated with aqueous KOH

Answer :

When ethyl chloride is treated with aqueous KOH the following reaction occurs :-

1650397551997

Question 10.22 What happens when

(v) methyl bromide is treated with sodium in the presence of dry ether

Answer :

When methyl bromide is treated with sodium in the presence of dry ether then following reaction occurs:-

1650397586595

Question 10.22 What happens when

(vi) methyl chloride is treated with KCN?

Answer :

When methyl chloride is treated with KCN the following reaction occurs:-

1650397621876

More About NCERT Solutions for Class 12 Chemistry Chapter 10 Haloalkanes And Haloarenes

Our body produces thyroxine hormone which contains iodine and deficiency of iodine can cause a disease called goiter. In this chapter, you will study methods of preparation, physical and chemical properties and uses of haloalkanes and haloarenes. You will find all the NCERT solutions for class 12 chemistry chapter 10 Haloalkanes and Haloarenes here for free.

Also Read| NCERT Exemplar Solutions For Haloalkanes And Haloarenes

This NCERT syllabus chapter carries 4 marks in the CBSE board exams hence it becomes necessary for you to find all the Class 12 Chemistry chapter 10 NCERT solutions haloalkanes and haloarenes to score good marks. In this NCERT book chapter, there are 9 intext questions and 22 questions in the exercise and you will get complete NCERT Solutions for Class 12 for reference.

These NCERT Solutions will help you in your preparation for CBSE Board exams as well as in competitive exams like JEE, NEET, BITSAT, and KVPY, etc. The seven sub-topics of NCERT solutions for Class 12 Chemistry chapter 10 Haloalkanes and Haloarenes covers important concepts like IUPAC nomenclature and preparation of haloalkanes and haloarenes and discuss how to use stereochemistry as a tool in the understanding the reaction mechanism and applications of organo-metallic compounds.

At the end of the chapter, the environmental effects of polyhalogen compounds are also highlighted. Halogenated compounds remain in the environment due to their resistance to breakdown by the bacteria in the soil. By referring to the NCERT Class 12 Chemistry solutions chapter 10, students can understand all the important concepts and practice questions well enough before their examination. Read the entire article to know more on Class 12 Chemistry chapter 10 NCERT solutions.

Some Important Basic Points of the NCERT Class 12 Chemistry Solutions Chapter 10

  • The replacement of one or more than one H-atom in an aliphatic hydrocarbon by halogen atoms results in the formation haloalkane or alkyl halide and the replacement of H-atoms in an aromatic hydrocarbon by halogen atoms results in the formation of haloarene or aryl halide.

  • In haloalkanes, halogen atoms attached to theSP^{3}hybridised carbon atom of an alkyl group.

  • in haloarenes, halogen atoms attached to theSP^{2}hybridised carbon atoms of an aryl group.

  • For better understanding use NCERT Solutions for Class 12 Chemistry chapter 10 PDF, students can download it by using an online webpage to PDF converter

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Benefits of NCERT solutions for class 12 chemistry chapter 10 Haloalkanes and Haloarenes

  • The detailed and comprehensive answers given in the NCERT Class 12 Chemistry solutions chapter 10 will be helpful in understanding the chapter easily.

  • Revision will be quite easier because the detailed solutions will help you to remember the concepts and get good marks in your class.

  • Homework problems won't bother you anymore, all you need to do is check the detailed NCERT solutions for Class 12 Chemistry and you are good to go.

If you have a doubt or question, these Class 12 Chemistry chapter 10 NCERT solutions will help you quickly. You will get all the answers that will help you score well in your exams.

Also Check NCERT Books and NCERT Syllabus here:

Frequently Asked Question (FAQs)

1. What are the important topics of this chapter?

Below is the list of important topics:

  • Preparation of haloalkanes

  • Physical properties of halo derivatives

  • Reactions of Haloalkanes Stereoisomerism Definition: Enantiomers, Racemic mixture, Racemisation Reactions of haloarenes

2. What is the weightage of NCERT Class 12 Chemistry chapter 10 in CBSE board exam?

Weightage of NCERT class 12 Chemistry chapter 10 in CBSE board exam is 4 marks. Follow NCERT syllabus and NCERT textbook for a good score in the exam. To practice more questions NCERT exemplar can also be used.

3. What is the weightage of NCERT Class 12 Chemistry chapter 10 in JEE Main and NEET?

This chapter consists of 4 marks in JEE mains. Weightage of NCERT class 12 Chemistry chapter 10 in NEET is 3%.

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hello,

Yes you can appear for the compartment paper again since CBSE gives three chances to a candidate to clear his/her exams so you still have two more attempts. However, you can appear for your improvement paper for all subjects but you cannot appear for the ones in which you have failed.

I hope this was helpful!

Good Luck

Hello dear,

If you was not able to clear 1st compartment and now you giving second compartment so YES, you can go for your improvement exam next year but if a student receives an improvement, they are given the opportunity to retake the boards as a private candidate the following year, but there are some requirements. First, the student must pass all of their subjects; if they received a compartment in any subject, they must then pass the compartment exam before being eligible for the improvement.


As you can registered yourself as private candidate for giving your improvement exam of 12 standard CBSE(Central Board of Secondary Education).For that you have to wait for a whole year which is bit difficult for you.


Positive side of waiting for whole year is you have a whole year to preparing yourself for your examination. You have no distraction or something which may causes your failure in the exams. In whole year you have to stay focused on your 12 standard examination for doing well in it. By this you get a highest marks as a comparison of others.


Believe in Yourself! You can make anything happen


All the very best.

Hello Student,

I appreciate your Interest in education. See the improvement is not restricted to one subject or multiple subjects  and  we cannot say if improvement in one subject in one year leads to improvement in more subjects in coming year.

You just need to have a revision of all subjects what you have completed in the school. have a revision and practice of subjects and concepts helps you better.

All the best.

Hi,

You just need to give the exams for the concerned two subjects in which you have got RT. There is no need to give exam for all of your subjects, you can just fill the form for the two subjects only.

View All

A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1)

0.34\; J

Option 2)

0.16\; J

Option 3)

1.00\; J

Option 4)

0.67\; J

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

Option 1)

2.45×10−3 kg

Option 2)

 6.45×10−3 kg

Option 3)

 9.89×10−3 kg

Option 4)

12.89×10−3 kg

 

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1)

2,000 \; J - 5,000\; J

Option 2)

200 \, \, J - 500 \, \, J

Option 3)

2\times 10^{5}J-3\times 10^{5}J

Option 4)

20,000 \, \, J - 50,000 \, \, J

A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

Option 1)

K/2\,

Option 2)

\; K\;

Option 3)

zero\;

Option 4)

K/4

In the reaction,

2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

Option 1)

11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

Option 2)

6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

Option 3)

33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

Option 4)

67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

Option 1)

0.02

Option 2)

3.125 × 10-2

Option 3)

1.25 × 10-2

Option 4)

2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1)

decrease twice

Option 2)

increase two fold

Option 3)

remain unchanged

Option 4)

be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1)

Molality

Option 2)

Weight fraction of solute

Option 3)

Fraction of solute present in water

Option 4)

Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

Option 1)

twice that in 60 g carbon

Option 2)

6.023 × 1022

Option 3)

half that in 8 g He

Option 4)

558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

Option 1)

less than 3

Option 2)

more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

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Reporter

Individuals who opt for a career as a reporter may often be at work on national holidays and festivities. He or she pitches various story ideas and covers news stories in risky situations. Students can pursue a BMC (Bachelor of Mass Communication), B.M.M. (Bachelor of Mass Media), or MAJMC (MA in Journalism and Mass Communication) to become a reporter. While we sit at home reporters travel to locations to collect information that carries a news value.  

2 Jobs Available
Corporate Executive

Are you searching for a Corporate Executive job description? A Corporate Executive role comes with administrative duties. He or she provides support to the leadership of the organisation. A Corporate Executive fulfils the business purpose and ensures its financial stability. In this article, we are going to discuss how to become corporate executive.

2 Jobs Available
Multimedia Specialist

A multimedia specialist is a media professional who creates, audio, videos, graphic image files, computer animations for multimedia applications. He or she is responsible for planning, producing, and maintaining websites and applications. 

2 Jobs Available
Welding Engineer

Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues. 

5 Jobs Available
QA Manager
4 Jobs Available
Quality Controller

A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product. 

A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.

3 Jobs Available
Production Manager
3 Jobs Available
Product Manager

A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

3 Jobs Available
QA Lead

A QA Lead is in charge of the QA Team. The role of QA Lead comes with the responsibility of assessing services and products in order to determine that he or she meets the quality standards. He or she develops, implements and manages test plans. 

2 Jobs Available
Structural Engineer

A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software. 

2 Jobs Available
Process Development Engineer

The Process Development Engineers design, implement, manufacture, mine, and other production systems using technical knowledge and expertise in the industry. They use computer modeling software to test technologies and machinery. An individual who is opting career as Process Development Engineer is responsible for developing cost-effective and efficient processes. They also monitor the production process and ensure it functions smoothly and efficiently.

2 Jobs Available
QA Manager
4 Jobs Available
AWS Solution Architect

An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party. 

4 Jobs Available
Azure Administrator

An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems. 

4 Jobs Available
Computer Programmer

Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.

3 Jobs Available
Product Manager

A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

3 Jobs Available
Information Security Manager

Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack 

3 Jobs Available
ITSM Manager
3 Jobs Available
Automation Test Engineer

An Automation Test Engineer job involves executing automated test scripts. He or she identifies the project’s problems and troubleshoots them. The role involves documenting the defect using management tools. He or she works with the application team in order to resolve any issues arising during the testing process. 

2 Jobs Available
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