Nitrous Acid Test
Primary aliphatic amine treated with nitrous acid evolves:
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More nitrogen organics Practice Questions
Aliphatic primary amine with nitrous acid gives:
Aliphatic primary amine with nitrous acid gives:
Gabriel phthalimide synthesis is used to prepare:
Gabriel phthalimide synthesis is used to prepare:
Hofmann bromamide reaction converts an amide to:
Hofmann bromamide reaction converts an amide to:
Diazonium salts couple with phenols in alkaline solution to form:
Diazonium salts couple with phenols in alkaline solution to form:
Diazotization of aniline performed at low temperature (~0–5°C) because:
Diazotization of aniline performed at low temperature (~0–5°C) because:
Replacement of diazonium with –OH occurs by heating aqueous solution yielding:
Replacement of diazonium with –OH occurs by heating aqueous solution yielding:
Carbylamine test requires chloroform and alcoholic KOH; characteristic product is:
Carbylamine test requires chloroform and alcoholic KOH; characteristic product is:
In Hinsberg test, secondary amine gives product that is:
In Hinsberg test, secondary amine gives product that is:
Aniline is less basic than methylamine due to:
Aniline is less basic than methylamine due to:
Amides are far less basic than amines because:
Amides are far less basic than amines because:
Gas phase basicity order (strongest base first) is typically:
Gas phase basicity order (strongest base first) is typically:
Treatment of benzenediazonium chloride with CuCN (Sandmeyer) yields:
Treatment of benzenediazonium chloride with CuCN (Sandmeyer) yields:
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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