Answer: Nitro compounds.
- A Nitro compounds
- B Alcohols
- C Aldehydes
- D Ethers
Correct answer: A. Nitro compounds
Explanation: Reduction of nitro compounds (e.g., nitrobenzene) gives amines.
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.