Which amine passes which test?
"Which amine passes which test?" is a free, interactive Class 12 Chemistry simulation for NEET and JEE, built on the lesson "Nitrous acid and Hinsberg's reagent" in Amines. Pick an amine and a test. The tube shows what you would see; the card on the right records each result for that amine. Carbylamine: primary amines only. Hinsberg: 1° soluble in alkali, 2° insoluble, 3° no reaction. Nitrous acid: 1° aliphatic gives N₂, aniline in the cold gives a diazonium salt. JEE Main asked 57 questions from this chapter across the 42 shifts Lumi has analysed (2017–2026).
From the lesson Nitrous acid and Hinsberg's reagent in Amines. Change the values and watch what happens.
In JEE Main
42 shifts analysed
57 questions from Amines across the 42 JEE Main shifts Lumi has analysed (2017–2026).
The idea behind it
NCERT §9.6
- Nitrous acid is made in the reaction mixture from sodium nitrite and a mineral acid. The three classes of amine react with it differently.
- Primary aliphatic amines give unstable aliphatic diazonium salts, which break down to an alcohol with quantitative release of nitrogen gas. Measuring that nitrogen is used to estimate amino acids and proteins.
- Aromatic primary amines react with nitrous acid at 273–278 K to form diazonium salts, which are the starting point for many aromatic compounds.
- Secondary and tertiary amines react with nitrous acid in other ways (not detailed in this unit).
- Hinsberg's reagent is benzenesulphonyl chloride, C₆H₅SO₂Cl. A primary amine gives an N-alkylbenzenesulphonamide whose N–H is strongly acidic, because the sulphonyl group withdraws electrons, so the product dissolves in alkali.
- A secondary amine gives an N,N-dialkylbenzenesulphonamide with no H on nitrogen, which is not acidic and does not dissolve in alkali. Tertiary amines do not react.
- These differences are used to tell 1°, 2° and 3° amines apart and to separate a mixture of them. Nowadays p-toluenesulphonyl chloride is used in place of benzenesulphonyl chloride.
Questions
3 answers
- What does the "Which amine passes which test?" simulation show?
- Pick an amine and a test. The tube shows what you would see; the card on the right records each result for that amine.
- Does JEE Main ask questions from Amines?
- Yes. JEE Main asked 57 questions from this chapter across the 42 shifts Lumi has analysed (2017–2026).
- Is this simulation free?
- Yes. It is free and runs in the browser on a phone or a laptop. It belongs to the lesson "Nitrous acid and Hinsberg's reagent" in Amines (Class 12 Chemistry).
Embed this simulation
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