Hinsberg's reagent is :
$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{SO}_{2} \mathrm{Cl}$
$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COCl}$
$\mathrm{SOCl}_{2}$
$(\mathrm{COCl})_{2}$
Correct Option: 1
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