Answer: Phenol.
- A Phenol
- B Aniline
- C Benzene
- D Toluene
Correct answer: A. Phenol
Explanation: The Reimer-Tiemann reaction is specific to phenol; it introduces a -CHO group ortho to -OH.
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.