Nitrous Acid Test
Easychemistry
Primary aliphatic amine treated with nitrous acid evolves:
Select the correct option:
Solution
Incorrect! Answer:
Nitrogen gas
- Reactant: Primary aliphatic amine (R−NH2).
- Reaction: R−NH2+HNO2(NaNO2+HCl)→[R−N2+Cl−]H2OR−OH+N2↑+HCl.
- Mechanism: The intermediate aliphatic diazonium salt is extremely unstable even at low temperatures.
- Observation: It breaks down immediately, typically forming an alcohol and liberating Nitrogen gas (N2) as brisk effervescence.
- Efficiency: Measuring the volume of N2 evolved is part of the Van Slyke method for estimating amino acids and proteins.
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About This Question
- Subject
- chemistry
- Chapter
- nitrogen organics
- Topic
- nitrous acid test
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Nitrogen gas
- Reactant: Primary aliphatic amine (R−NH2).
- Reaction: R−NH2+HNO2(NaNO2+HCl)→[R−N2+Cl−]H2OR−OH+N2↑+HCl.
- Mechanism: The intermediate aliphatic diazonium salt is extremely unstable even at low temperatures.
- Observation: It breaks down immediately, typically forming an alcohol and liberating Nitrogen gas (N2) as brisk effervescence.
- Efficiency: Measuring the volume of N2 evolved is part of the Van Slyke method for estimating amino acids and proteins.
This easy difficulty chemistry question is from the chapter nitrogen organics, covering the topic of nitrous acid test. It appeared in the 2025 exam.
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