MHT CET · Chemistry · Amines

The major product formed in carbylamine reaction is

A Alkyl halide
B Alkyl cyanide
C Nitroalkane
D Alkyl isocyanide

Verified Solution

Answer & Solution

Correct Answer

(D) Alkyl isocyanide

Step-by-step Solution

Detailed explanation

Aliphatic or aromatic primary amines on heating with chloroform give foul (offensive) smelling products called alkyl/aryl isocyanides or carbylamines.
\(\mathrm{R}-\mathrm{NH}_2+\mathrm{CHCl}_3+3 \mathrm{KOH} \xrightarrow[\text { alc. }]{\Delta}\) \(\underset{\substack{\text {Alkyl isocyanide} \\ \text {(Carbylamine)}}}{\mathrm{R}-\mathrm{NC}+3 \mathrm{KCl}+3 \mathrm{H}_2 \mathrm{O}}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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