Answer: N-methylethanamine.
- A propan-1-amine
- B N-ethylmethanamine
- C N-methylethanamine
- D propan-2-amine
Correct answer: C. N-methylethanamine
Explanation: The longer chain (ethane, two carbons) is the parent ethanamine, and the methyl on nitrogen is an N-substituent: N-methylethanamine.
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.