Answer: sp3.
- A sp3
- B sp2
- C sp
- D sp3d
Correct answer: A. sp3
Explanation: Nitrogen in amines is sp3 hybridised with a lone pair, giving a pyramidal geometry.
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.