Discussion
Which of the following answers positively in carbylamine test?
Answer: C
The amine that gives a positive carbylamine test is benzenamine (aniline).
The carbylamine (isocyanide) test, heating with chloroform and alcoholic KOH, is given only by primary amines, aliphatic or aromatic. They form isocyanides, recognised by their foul smell. Benzenamine, C6H5NH2, is a primary amine.
N-ethylmethanamine and N-methylbenzenamine are secondary amines, and N,N-dimethylethanamine and N,N-dimethylbenzenamine are tertiary amines; none of them gives the test.
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