Which component is most active for bleaching action in bleaching powder?

Shapes of certain interhalogen compounds are stated below. Which one of them is not correctly stated?

Assertion : $SnI_4$ is an orange solid.
Reason : The colour arises due to charge transfer.

When $MnO_2$ and $H_2SO_4$ are added to $NaCl$,the greenish-yellow gas liberated is:

$POCl_3$ is prepared by the reaction of:
$(I)$ $P_4 + SO_2Cl_2 \to$
$(II)$ $P_4 + SOCl_2 \to$
$(III)$ $PCl_5 + SO_2 \to$
$(IV)$ $PCl_5 + C_2H_5OH \to$

Chlorine gas is dried over