Question

Hinsberg reaction is used to test which compound and what is the reagent?

• A. Aldehyde test, reagent: Tollens' reagent
• B. Primary, secondary and tertiary amine test, reagent: \(C_{6}H_{5}SO_{2}Cl+NaOH\)
• C. Alcohol test, reagent: Lucas reagent
• D. Carboxylic acid test, reagent: \(NaHCO_{3}\)

Hint:

Remember these important qualitative tests: \[ \boxed{ \begin{aligned} \text{Hinsberg Test} &\rightarrow \text{Amines}\\ \text{Lucas Test} &\rightarrow \text{Alcohols}\\ \text{Tollens' Test} &\rightarrow \text{Aldehydes}\\ NaHCO_3 &\rightarrow \text{Carboxylic Acids} \end{aligned} } \] Hinsberg reagent is \[ \boxed{C_6H_5SO_2Cl+NaOH.} \]

Answer 1

The Correct Option is B

The Hinsberg test uses benzenesulfonyl chloride ($C_6H_5SO_2Cl$) to distinguish primary, secondary, and tertiary amines. Primary amines yield a sulfonamide salt soluble in alkali, secondary amines give an insoluble sulfonamide, and tertiary amines do not react because they lack an N-H bond available for sulfonylation.