Answer: a mixture of amines of all classes.
- A a pure sample of ethanamine
- B only diethylamine is formed
- C a mixture of amines of all classes
- D only triethylamine is formed
Correct answer: C. a mixture of amines of all classes
Explanation: Ammonolysis is hard to stop at one stage; successive alkylation gives a mixture of primary, secondary and tertiary amines with the quaternary salt.
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.