Question

Q.(a) only primary amine gives carbyl amine reaction. why
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Answer 1

Answer:

The carbylamine reaction (also known as the Hoffmann isocyanide synthesis) is the synthesis of an isocyanide by the reaction of a primary amine, chloroform, and base. The conversion involves the intermediacy of dichlorocarbene. ... It is used to prepare secondary amines.

Answer 2

Answer:

only primary amine gives carbyl amine reaction

Explanation:

Carbylamine reaction mechanism includes the addition of amine to the intermediate created from the dehydrohalogenation of chloroform. This intermediate is called dichlorocarbene. The carbylamine reaction is also known as Hofmann isocyanide synthesis. It is the reaction of a primary amine, chloroform and a base to synthesize isocyanides. The dichlorocarbene intermediate is very important for this conversion. The carbylamine reaction cannot be used to synthesize isocyanides from secondary or tertiary amines.

Secondary and tertiary amines do not for isocyanides when made to undergo carbylamine reaction. Since they have more than one alkyl group which hinders the approach of -NH2 group.