Answer: Methanamine.
- A Methanamine
- B Ethanamine
- C Methanol
- D Methylamine oxide
Correct answer: A. Methanamine
Explanation: CH<sub>3</sub>NH<sub>2</sub> is methanamine (commonly called methylamine).
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.