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The chapter, Amines is the addition of the NCERT chapter, Aldehydes, Ketones, & Carboxylic Acids. The NCERT Class 12 Chemistry chapter 13 notes covers a brief idea of the chapter on Amines. The prime topics included in Class 12 Chemistry chapter 13 notes are Amines, their Nomenclature, their Classification, their Preparation, their Physical Properties, their Structure, their Chemical Reactions. NCERT Class 12 Chemistry chapter 13 notes also comprise of a brief introduction to diazonium salts, their Physical Properties, their Methods of Preparation, their Chemical Reactions, their Importance in Synthesis of Aromatic Compounds.
Class 12 Chemistry chapter 13 notes covers the basic chemical equations in the chapter. The important structural formulas and chemical equations are included in the CBSE Class 12 Chemistry chapter 13 notes. These Amines Class 12 notes comprise of some solved examples related to mentioned topics. Class 12 Chemistry chapter 13 notes pdf download has link to all downloadable topics.
Also, students can refer,
When hydrogens in ammonia are replaced by one or more alkyl or aryl groups, amines are formed. They are derivatives of ammonia.
Structure of amines:
Hybridization: sp3
Geometry: pyramidal
No. of lone pairs: 1
Bond angle: less than 109.5°
Classification of amines:
On the basis of the number of hydrogen atoms replaced by alkyl or aryl groups in the ammonia molecule amines can be of 3 types:
Primary
Secondary
Tertiary
Nomenclature:
Amines are named alkanamines in the IUPAC system. Di, tri, etc prefixes are used depending on the no. of -NH2 group attached to the carbon chain.
Examples are given in the tabular form:
Amine | Common name | IUPAC name |
Ethylamine | Ethanamine | |
n-Propylamine | Propan-1-amine | |
Isopropylamine | Propan-2-amine | |
Ethylmethylamine | N-Methylethanamine | |
Trimethylamine | N, N-Dimethylmethanamine | |
N,N-Diethylbutylamine | N,N-Diethylbutan-1-amine | |
Allylamine | Prop-2-en-1-amine | |
Hexamethylenediamine | Hexane-1,6-diamine | |
Aniline | Aniline or Benzenamine | |
o-Toluidine | 2-Methylaniline | |
p-Bromoaniline | 4-Bromobenzenamine or 4-Bromoaniline | |
N, N-Dimethylaniline | N,N-Dimethylbenzenamine |
1. Reduction of nitro compounds
Nitro compounds are reduced to amines in the presence of finely divided Ni, Pd, or Pt & by passing hydrogen gas. Amines can also be prepared by reduction with metals in an acidic medium.
2. Ammonolysis of alkyl halides
Ammonia undergoes a nucleophilic substitution reaction in which a halogen atom is replaced by an amino group. The process by which ammonia molecules cleave the C-X bond is called ammonolysis.
The reactivity order of halides with amines: RI > RBr >RCl
3. Reduction of nitriles
Nitriles on catalytic hydrogenation or reduction with lithium aluminum hydride produce primary amines.
4. Reduction of amides
Amides undergo reduction to produce amines.
5. Gabriel phthalimide synthesis
Gabriel phthalimide synthesis is a reaction that involves the conversion of primary alkyl halides into primary amines using alkyl halides.
6. Hoffmann bromamide degradation reaction
Primary amines having 3 or more C are liquid & heavier ones are solid.
Aryl amines are generally colorless but on atmospheric oxidation gain color.
Amines are polar molecules due to the presence of lone pairs which induce large dipole moments.
The primary & secondary amine can undergo H bonding. The tertiary amine cannot undergo H bonding but can accept H bonds from N-H or O-H bonds.
In amines solubility decrease as the molar mass of amines increases. This is because the hydrophobic alkyl part increases in size. Amines with high molecular mass are insoluble in water.
Boiling point : Ethers (similar molecular weights) < Primary & secondary amine < alcohols ; Primary ≈ Secondary > Tertiary amines
Amines are reactive due to the presence of electronegativity difference between N & H & the presence of lone pairs.
1. Basic character of amines
Amines react with acid to form salts.
Structure-basicity relationship of amines
(a) Alkanamines versus ammonia
The basicity order of amines in the gaseous phase: 3° amine > 2° amine > 1° amine > ammonia
The basicity order of aliphatic amines: 1° > 2° > 3°
The order of basic strength in case of substituted amines:
(b) Arylamines versus ammonia
In the case of substituted arylamines, electron releasing groups like –OCH3, –CH3 increase basic strength whereas electron-withdrawing groups like –NO2, –SO3H, –COOH, –X decrease basic strength.
2. Alkylation
3. Acylation
Aliphatic & aromatic primary & secondary amines undergo nucleophilic substitution reactions with acid chlorides, anhydrides & esters.
4. Carbylamine reaction
5. Reaction with nitrous acid
(a) Primary aliphatic amines from aliphatic diazonium salts on reaction with nitrous acid.
(b) Aromatic amines form diazonium salts on reaction with nitrous acid at low temperatures.
6. Reaction with aryl sulphonyl chloride
(a) The reaction of benzene sulphonyl chloride yields N-ethylbenzenesulphonyl amide on reaction with a primary amine.
(b) N, N-diethyl benzene sulphonamide is formed in the reaction with a secondary amine with benzene sulphonyl chloride.
(c) Tertiary amines & benzene sulphonyl chloride do not react.
7. Electrophilic substitution
(a) Bromination:
(b) Nitration:
(c) Sulphonation:
The diazonium salts have the general formula – RN2 + X- where R stands for an aryl group & X- ion may be Cl-, Br-, HSO4-, BF4-, etc.
Nomenclature: The name of parent hydrocarbon is added as prefix & name of anion after diazonium. Example: benzenediazonium chloride etc.
1° aliphatic amines form highly unstable alkyl diazonium salts & 1° aromatic amines form arene diazonium salts (stable at low temperature for short time).
The reaction of aniline with nitrous acid produces Benzenediazonium chloride. Diazotisation is the term coined for the conversion of primary aromatic amines into diazonium salts.
colorless crystalline solid
soluble in water (cold water-stable; warm water - react)
decomposes easily in the dry state
Some diazonium salts like Benzenediazonium fluoroborate are water-insoluble & stable at room temperature.
(A) reactions involving displacement of nitrogen
1. Replacement by halide or cyanide ion:
Also known as the S&meyer reaction; involves the nucleophilic substitution of diazonium salt to give aryl halide in presence of Cu(I) ion.
Also known as the Gatterman reaction; involves the nucleophilic substitution of diazonium salt to give aryl halide in the presence of copper powder. S&meyer’s reaction is better than Gattermann’s reaction.
2. Replacement by iodide ion:
Iodobenzene is formed when a diazonium salt solution is treated with potassium iodide.
3. Replacement by fluoride ion:
Arene diazonium fluoroborate is produced on treating arene diazonium chloride with fluoroboric acid which on heating decomposes to yield aryl fluoride.
4. Replacement by H:
Diazonium salts are reduced to arenes when treated with ethanol or hypophosphorous acid.
5. Replacement by hydroxyl group:
6. Replacement by –NO2 group:
The Diazonium group is replaced by the –NO2 group when the diazonium fluoroborate is heated with aqueous NaNO2 in the presence of Cu.
B. Reactions involving retention of diazo group
Coupling reactions:
A reaction between Benzene diazonium chloride & phenol results in coupling between two molecules at the para position of phenol via -N=N- bond. P-hydroxyazobenzene is formed as a product.
Azo coupling of sulfanilamide acid & N-(1-Naphthyl)ethylenediamine
Importance of Diazonium Salts in Synthesis of Aromatic Compounds
Diazonium salts are a very good intermediate therefore they are helpful in a reaction where direct substitution is not possible. For example, aryl fluorides, aryl iodides, cyanobenzene, & chlorobenzene can not be prepared by direct substitution but are easily prepared when the diazo group is introduced.
Amines Class 12 notes will be helpful to revise the chapter & to get an idea about the main topics covered in the chapter. Also, this NCERT Class 12 Chemistry chapter 13 notes are useful to cover the main topics of the Class 12 CBSE Chemistry Syllabus & also for competitive exams like VITEEE, BITSAT, JEE Core, NEET, etc. Class 12 Chemistry chapter 13 notes pdf download can be used to prepare in offline mode.
Ans-The S&meyer reaction, Gattermann reaction, Hoffman reaction are important reactions as covered in the ncert notes for Class 12 Chemistry Chapter 13. This NCERT Class 12 Chemistry chapter 13 notes is a brief of the main topics & chemical equations covered in the chapter & can be used for revising the Amines.
Ans-The S&meyer reaction, Gattermann reaction, Hoffman reaction are important reactions as covered in the ncert notes for Class 12 Chemistry Chapter 13. This NCERT Class 12 Chemistry chapter 13 notes is a brief of the main topics & chemical equations covered in the chapter & can be used for revising the Amines.
Ans- Students can expect 2 to 5 mark questions (including chemical reaction questions) from the chapter Amines.
Ans- On the basis of the number of H atoms replaced by -R or -Ar groups in the ammonia molecule, as given in ncert notes for class 12 chemistry Chapter 13, amines are of 3 types:
Primary
Secondary
Tertiary
Ans- As stated in class 12 Amines notes, when hydrogens in ammonia are replaced by one or more alkyl or aryl groups, amines are formed. They are derivatives of ammonia.
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