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How many of the following compounds give a positive carbylamine (isocyanide) test? (a) cyclohexylamine (b) acetamide (CH3CONH2) (c) aniline (C6H5NH2) (d) tert-butylamine (e) sec-butylamine (butan-2-amine) (f) diethylamine (g) N,N-diethylmethylamine (h) benzylamine (C6H5CH2NH2)

1. 2
2. 8
3. 5
4. 1

Correct answer: 5

Solution

Among the listed compounds, exactly five are primary amines: cyclohexylamine (a), aniline (c), tert-butylamine (d), sec-butylamine (e), and benzylamine (h). Acetamide is an amide, diethylamine is secondary, and N,N-diethylmethylamine is tertiary — all three test negative.

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