Answer: Isocyanide.
- A Isocyanide
- B Cyanide
- C Amide
- D Nitrile
Correct answer: A. Isocyanide
Explanation: Primary amines react with CHCl<sub>3</sub>/KOH to form isocyanides (carbylamines), which have a very offensive smell.
In aniline, the nitrogen's lone pair is pulled into the benzene ring through resonance, leaving less electron density available to accept a proton - which is why aniline is a much weaker base than methylamine, where the lone pair is fully available.
Concept context
Nitrogen-containing organic compounds. Covers classification (primary, secondary, tertiary), basicity comparison, preparation methods, and reactions including diazotization and coupling, key for understanding dyes and pharmaceuticals.