Question

Which from following amines does NOT form alkyl isocyanide when heated with alc. KOH and chloroform

• A. Methanamine
• B. Propan-2-amine
• C. N, N-Diethylethanamine
• D. Ethanamine

Hint:

Only primary amines give isocyanides.

Answer 1

The Correct Option is C

Step 1: Test each option:
Methanamine, propan-2-amine and ethanamine each carry an $-\text{NH}_2$ group, so they all give the carbylamine reaction.

Step 2: Odd one out:
Triethylamine has three alkyl groups on nitrogen and no N-H, so it is the one that does not react.

Final Answer:
The answer is $N,N$-diethylethanamine, option (C). \[ \boxed{N,N\text{-Diethylethanamine}} \]