Question

Carbylamine test is performed in alcoholic KOH by heating a mixture of : (a) chloroform and silver powder(b) trihalogenatedmethane and a primary amine(c) an alkyl halide and a primary amine(d) an alkyl cyanide and a primary amine

Answer 1

hey mate
opting B is the correct answer

Answer 2

Answer:

(b) trihalogenatedmethane and a primary amine is the correct answer.

Explanation:

Hoffman gave carbylamine test.

It is also called as isocyanide test.

Aliphatic and aromatic primary amines on heating with chloroform and alcoholic potassium hydroxide gives foul smelling alkyl isocyanides or carbylamines.

This test is not given by secondary and tertiary amines.

It is basically alpha elimination reaction.

Dichlorocarbene is formed as an intermediate in this reaction.

RNH2+ CHCl3 + KOH ===> RNC + KCl + 3H2O.

Thus,

Carbylamine test is performed in alcoholic KOH by heating a mixture of trihalogenatedmethane and a primary amine.

Hence,

(b) trihalogenatedmethane and a primary amine is the correct answer.