Which of the following give a positive carbylamine test?

A $(CH X_{3}) X_{2} CHNH X_{2}$
B $CH X_{3} CH X_{2} NH X_{2}$
C $C X_{6} H X_{5} NHCH X_{3}$
D $C X_{6} H X_{5} NH X_{2}$

Answer: A, B, D

Carbylamine formation requires a primary amino group with two N-H bonds that are lost as two molecules of HCl. Ethylamine, aniline and propan-2-amine are primary and give isocyanides. N-Methylaniline is a secondary amine and does not.

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