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Which reaction correctly represents the interaction of a primary amine with chloroform to produce an isocyanide?

1. (a) RNH2 reacts with CHCl3 to form RNC
2. (b) RNH2 reacts with CHCl3 to form RNC
3. (c) RNH2 reacts with CHCl3 to form RNC
4. (d) RNH2 reacts with CHCl3 to form RNC

Correct answer: (a) RNH2 reacts with CHCl3 to form RNC

Solution

The reaction of a primary amine (RNH2) with chloroform (CHCl3) in the presence of a base forms an isocyanide (RNC). This is the carbylamine reaction, which is specific to primary amines.

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