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  4. Hinsberg reagent is benzenesulfonyl chloride. In aqueous KOH this reacts with primary amine ( RNH2 ) to give a clear solution which on acidification gives a white precipitate, which is due to the formation of

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Q. Hinsberg reagent is benzenesulfonyl chloride. In aqueous $KOH$ this reacts with primary amine ( $RNH_{2}$ ) to give a clear solution which on acidification gives a white precipitate, which is due to the formation of

NTA AbhyasNTA Abhyas 2022

Solution:

The primary amines initially form sulfonamide which deprotonated by base giving water soluble salt.
$C_{6}H_{5}SO_{2}Cl+RNH_{2} \rightarrow RNHSO_{2}C_{6}H_{5}$
$RNHSO_{2}C_{6}H_{5} \xrightarrow{KOH} R\overset{\ominus}{N}SO_{2}C_{6}H_{5}K^{\oplus}$
$R\overset{\ominus}{N}SO_{2}C_{6}H_{5}K^{\oplus} \xrightarrow{\text{Acidification}}RNHSO_{2}C_{6}H_{5}$