Answer: Acetanilide.
- A Acetanilide
- B Benzamide
- C Phenol
- D Nitrobenzene
Correct answer: A. Acetanilide
Explanation: Aniline reacts with acetic anhydride to form acetanilide (N-phenylethanamide).
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.