Which of the following amine (s) show (s) positive carbylamines test? A. (see structure) B. $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}$ C. $\mathrm{CH}_{3} \mathrm{NH}_{2}$ D. $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}$ E. (see structure) Choose the correct answer from the options given below :

JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Compounds Containing Nitrogen

Which of the following amine (s) show (s) positive carbylamines test?

A. (see structure)

B.

(CH_{3})_{2} NH

CH_{3} NH_{2}

(CH_{3})_{3} N

E. (see structure)

Choose the correct answer from the options given below :

(A)A and E Only
(B)C Only
(C)A and C Only✓ Correct
(D)B, C and D Only

Answer: (C)

Solution

The carbylamine test is positive only for primary amines, which react with chloroform and alcoholic KOH to give foul-smelling isocyanides. Aniline and methylamine are primary and give the test, whereas dimethylamine and N-methylaniline are secondary and trimethylamine is tertiary, so none of these responds. The amines that give a positive carbylamine test are aniline and methylamine.

JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Single correct option

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