Question

The presence of primary amines can be confirmed by ______.

Options

• Reaction with HNO₂ 

• Reaction with CHCl₃ and alc. KOH 

• Reaction with Grignard reagent

• Reaction with Acetyl chloride

Answer 1

The presence of primary amines can be confirmed by Reaction with CHCl₃ and alc. KOH.

Explanation:

Only primary amine give carbylamine reaction. (disagreeable smell of in cyanides is obtained)

\[\ce{R - NH2 + CHCl3 ->[KOH] R - \overset{+}{N} ≡ \bar{\text{C}} + 3KCl + 3H2O}\]