Question:

An amine ‘X’ reacts with Hinsberg reagent and the product obtained is insoluble in alkali. The amine ‘X’ is:

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Hinsberg test: Primary amine → soluble sulfonamide; secondary → insoluble; tertiary → no reaction.
  • (CH$_3$)$_2$–NH
  • (CH$_3$)$_3$N
  • CH$_3$–CH$_2$–NH$_2$
  • \chemfig{*6(=-=-=-)-NH_2} (Aniline)
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The Correct Option is A

Solution and Explanation

A secondary amine reacts with Hinsberg reagent to form a sulfonamide that does not dissolve in alkali, confirming that ‘X’ is a secondary amine.
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