1 Marks Important Question of Amine

AMINES

Q. 3. Draw structure of TNT, an explosive.

Ans.

Q. 6. What is Hinsberg’s reagent ?

Ans. Benzene sulphonyl chloride,

Q. 14. What happens when aniline is treated with bromine ?

Ans.

Q. 2. Write chemical reaction of C₆H₅NH₂ + C₆H₅COCl and name product obtained.

Ans.

Q. 3. Write short note on the following :

1. Carbylamine reaction
2. Diazotization
3. Hoffmann’s bromide reaction
4. Coupling reaction
5. Ammonolysis

Ans. (i) Carbylamine reaction : When primary amine (aromatic or aliphatic) warmed with chloroform and alc. KOH, isocyanides are formed which can be identifi ed by their offensive smell. This test is used to identify the presence of primary amine or chloroform.

RCH2NH2 + CHCl3 + 3KOH (alc.) → RCH2NC + 3KCl + 3H2O

1. Diazotization : When primary aromatic amine is treated with NaNO₂ and HCl at 273-278 K, diazonium salt is obtained. This reaction is known as diazotization.

Benzenediazonium chloride is a very important synthetic compound, which can be changed into heloarenes, phenol, cyanobenzene, benzene etc.

1. Hoffmann’s bromide reaction : When any primary amide (aliphatic or aromatic) is treated with bromine and alkali, it gives the amine of one carbon atom less.

This reaction is used to reduce one carbon atom from a compound.

1. Coupling reaction : When benzenediazonium chloride is treated with phenols or aromatic amines, azo dyes are produced in which diazo ( N = N ) group is retained. Coupling reactions generally take place at p-position of phenol or aromatic amines.

1. Ammonolysis : Reaction of alkyl halides with ammonia is known as ammonolysis. Ammonolysis generally gives the mixture of 1”, 2”, 3” amines and quaternary ammonium salt.

Q. 6. Accomplish the following conversions :

1. C₆H₅NO₂ → C₆H₅ – COOH
2. Benzene → m-bromophenol
3. C₆H₅COOH → C₆H₅NH₂
4. Aniline → 2, 4, 6 tribromoaniline
5. Benzylchloride → 2-phenyl ethanamine

(i)
(ii)
(iii)
(iv)
(v)