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

Concept: The Hinsberg reaction is a qualitative test used to distinguish between primary, secondary and tertiary amines. The reagent employed is Hinsberg reagent, which is benzenesulphonyl chloride, \[ \boxed{C_6H_5SO_2Cl} \] used in the presence of aqueous sodium hydroxide. Depending on the type of amine, different products are formed, making identification possible.

Step 1: Identify the purpose of the Hinsberg reaction.
The Hinsberg test is specifically used to identify \[ \boxed{\text{Primary, Secondary and Tertiary amines}.} \] It is not used for aldehydes, alcohols or carboxylic acids.

Step 2: Identify the reagent used.
The reagent required is \[ \boxed{C_6H_5SO_2Cl} \] (Benzenesulphonyl chloride) in the presence of \[ \boxed{NaOH.} \] This reagent is commonly known as Hinsberg reagent.

Step 3: Compare the options.
Option (A): Tollens' reagent is used for aldehydes. Option (B): Correctly states the purpose and reagent. Option (C): Lucas reagent is used for classification of alcohols. Option (D): Sodium bicarbonate is used to identify carboxylic acids. Therefore, \[ \boxed{\textbf{Option (B)}} \] is the correct answer.