Question

Which of the following is used as Hinsberg’s reagent?

• A. $C_6{H}_{5}S{O}_{2}Cl$
• B. $C_6{H}_{5}S{O}_{3}H$
• C. $C_6{H}_{5}NHC{H}_3$
• D. $C_6{H}_{5}COC{H}_3$

Answer 1

Answer: (A)

Hinsberg's reagent is used to differentiate the amines into $1^0$ or $2^0$ or $3^0$.
The chemical formula for Hinsberg reagent is $C_6{H}_{5}S{O}_{2}Cl$ i.e Benzene sulphonyl chloride.
Primary amines get converted to sulphonamide in presence of Hinsberg reagent which is soluble in $NaOH$
secondary amines get converted to sulphonamide in presence of Hinsberg reagent which is insoluble in $NaOH$
There is no reaction of Hinsberg reagent with tertiary amines.