IMPORTANT QUESTIONS FOR REVISION
AMINES
1. Explain the reduction of amines from nitro compounds.
Nitro compounds are reduced to amines by passing hydrogen gas in the presence of finely
divided nickel, palladium or platinum and also by reduction with metals in acidic medium.
2. Explain Hoffmann Bromamide degradation reaction with an example.
Primary amines are prepared by treating an amide with bromine in an aqueous or ethanolic
solution of sodium hydroxide.
3. Explain carbylamine reaction with example.
Aliphatic and aromatic primary amines on heating with chloroform and ethanolic potassium
hydroxide form isocyanides or carbylamines which are foul smelling substances.
4. What is diazotisation? Give example.
Benzenediazonium chloride is prepared by the reaction of aniline with nitrous acid at 273-
278K. Nitrous acid is produced in the reaction mixture by the reaction of sodium nitrite with
hydrochloric acid.
5. What is the action of bromine water on benzene amine at room temperature.
Aniline reacts with bromine water at room temperature to give a white precipitate of 2,4,6-
tribromoaniline.
AMINES
1. Explain the reduction of amines from nitro compounds.
Nitro compounds are reduced to amines by passing hydrogen gas in the presence of finely
divided nickel, palladium or platinum and also by reduction with metals in acidic medium.
2. Explain Hoffmann Bromamide degradation reaction with an example.
Primary amines are prepared by treating an amide with bromine in an aqueous or ethanolic
solution of sodium hydroxide.
3. Explain carbylamine reaction with example.
Aliphatic and aromatic primary amines on heating with chloroform and ethanolic potassium
hydroxide form isocyanides or carbylamines which are foul smelling substances.
4. What is diazotisation? Give example.
Benzenediazonium chloride is prepared by the reaction of aniline with nitrous acid at 273-
278K. Nitrous acid is produced in the reaction mixture by the reaction of sodium nitrite with
hydrochloric acid.
5. What is the action of bromine water on benzene amine at room temperature.
Aniline reacts with bromine water at room temperature to give a white precipitate of 2,4,6-
tribromoaniline.
