Nitrous Acid Test
Easychemistry
Aliphatic primary amine with nitrous acid gives:
Select the correct option:
Solution
Incorrect! Answer:
Alcohol with N₂ evolution
The reaction with Nitrous Acid (HNO2) is used to distinguish between classes of amines:
- Aliphatic 1circ Amines: React to form an extremely unstable diazonium salt that decomposes even at 0∘C. R−NH2+HNO2→[R−N2+Cl−]H2OR−OH+N2↑+HCl
- Observation: Rapid effervescence of Nitrogen gas and formation of an alcohol.
- Aromatic 1circ Amines: Form stable diazonium salts at 0−5∘C with NO gas evolution.
- Secondary Amines: Form yellow oily N-nitrosoamines.
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About This Question
- Subject
- chemistry
- Chapter
- organic compounds containing nitrogen
- Topic
- nitrous acid test
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Alcohol with N₂ evolution
The reaction with Nitrous Acid (HNO2) is used to distinguish between classes of amines:
- Aliphatic 1circ Amines: React to form an extremely unstable diazonium salt that decomposes even at 0∘C. R−NH2+HNO2→[R−N2+Cl−]H2OR−OH+N2↑+HCl
- Observation: Rapid effervescence of Nitrogen gas and formation of an alcohol.
- Aromatic 1circ Amines: Form stable diazonium salts at 0−5∘C with NO gas evolution.
- Secondary Amines: Form yellow oily N-nitrosoamines.
This easy difficulty chemistry question is from the chapter organic compounds containing nitrogen, covering the topic of nitrous acid test. It appeared in the 2025 exam.
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