Which of the following give a positive carbylamine test (foul-smelling isocyanide)?

A4-methylaniline
BN-methylaniline
C $(CH X_{3}) X_{3} CNH X_{2}$
DN,N-dimethylaniline

Answer: A, C

The carbylamine test depends only on the presence of an

- NH X_{2}

group, whatever the type of carbon it is attached to. tert-Butylamine and 4-methylaniline are primary; N-methylaniline is secondary and N,N-dimethylaniline is tertiary.

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