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Benzenesulphonyl chloride is used in the Hinsberg test to distinguish primary, secondary, and tertiary amines based on solubility in alkali, as per the PDF.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1
Benzenesulphonyl chloride (Hinsberg’s reagent) reacts with primary amines to form sulphonamides with an acidic hydrogen, soluble in alkali. Secondary amines form insoluble sulphonamides without acidic hydrogen.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Chemical Reactions - Alkylation, Acylation and Electrophilic Substitution
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