Answer: Primary aliphatic amines.
- A Primary aliphatic amines
- B Aromatic amines as generally observed
- C Tertiary amines in typical laboratory settings
- D Secondary amines under usual circumstances
Correct answer: A. Primary aliphatic amines
Explanation: Gabriel synthesis converts phthalimide to primary aliphatic amines via alkylation and hydrolysis.
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.