Answer: propan-1-amine.
- A ethanamine
- B propan-1-amine
- C propan-2-amine
- D N-methylethanamine
Correct answer: B. propan-1-amine
Explanation: A nitrile gains two hydrogens to become -CH<sub>2</sub>NH<sub>2</sub>, so propanenitrile gives the primary amine propan-1-amine.
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.