Answer: N-Nitrosamine (yellow oily liquid).
- A N-Nitrosamine (yellow oily liquid)
- B N<sub>2</sub> gas released by deamination of the amine
- C An unstable diazonium salt that decomposes at room temperature
- D An amide formed by oxidation of the secondary nitrogen
Correct answer: A. N-Nitrosamine (yellow oily liquid)
Explanation: Secondary amines react with HNO<sub>2</sub> to form N-nitroso compounds (yellow oily liquids).
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.