Which of the following(s) can be detected by carbylamine reaction?

Urea

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C H_{3} C O N H_{2}

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C_{2} H_{5} N H_{2}

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C_{6} H_{5} N H_{2}

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Solution

The correct option is D $C_{6} H_{5} N H_{2}$
Carbylamine reaction is given by primary amines. It is not given by secondary or tertiary amines.
Aniline is a primary aromatic amine so it will positive carbylamine test.
$C_{2} H_{5} N H_{2}$ also give positive carbylamine test.

In carbylamine reaction, the primary amine is heated with $C H C l_{3}$ and $K O H$ to form isocyanide. Formation of isocynaide is indicated by the obnoxious smell. This confirms the presence of primary amino group.

Amide does not give positive carbylamine test.
Hence, (a) and (b) cannot be detected by carbylamine reaction.

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