Hinsberg's reagent is :

$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{SO}_{2} \mathrm{Cl}$

$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COCl}$

$\mathrm{SOCl}_{2}$

$(\mathrm{COCl})_{2}$