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Question
Describe Hinsberg method for the identification of primary, secondary and tertiary amines. Also write the chemical equations of the reactions involved.
Solution
Hinsberg's method: Benzenesulphonyl chloride (C6H5SO2Cl) (known as Hinsberg’s reagent) reacts with primary and secondary amines to form sulphonamides. The method is used for the distinction of primary, secondary and tertiary amines.
Sulphonamide formed in case of a primary (1°) amine is soluble in an alkali.
Sulphonamide formed in case of a secondary (2°) amine remains insoluble in an alkali.
A tertiary (3°) amine does not give a positive Hinsberg test.
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What is the action of nitrous acid on secondary nitroalkane?
What is the action of nitrous acid on tertiary nitroalkane
Primary, secondary and tertiary amines may be separated by using ______.
Identify the compound that will react with Hinsberg’s reagent to give a solid which dissolves in alkali.
Identify the compound that will react with Hinsberg’s reagent to give a solid which dissolves in alkali.
Match List I with List II.
| List I | List II | ||
| (A) | Benzenesulphonyl chloride | (I) | Test for primary amines |
| (B) | Hoffmann bromamide reaction | (II) | Anti Saytzeff |
| (C) | Carbylamine reaction | (III) | Hinsberg reagent |
| (D) | Hoffmann orientation | (IV) | Known reaction of Isocyanates |
Choose the correct answer from the options given below:
A compound 'X' on treatment with Br2/NaOH, provided C3H9N, which gives positive carbylamine test. Compound 'X' is ______.
Give reasons:
(CH3)2NH is more basic than (CH3)3N in an aqueous solution.
Carbylamine test is the distinguishing test for ______.
