Answer: They form basic solutions.
- A They form basic solutions
- B They produce H<sub>2</sub> under usual circumstances
- C They produce O<sub>2</sub> according to most researchers
- D No reaction in the majority of cases studied
Correct answer: A. They form basic solutions
Explanation: Amines are basic and accept protons from water to form alkaline solutions.
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.