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

$I_2$ dissolves in $KI$ solution due to the formation of

Oxyacids of chlorine show similarity in

Which of the following oxoacids of chlorine is the least oxidizing in nature?

Phosphorus reacts with $SO_2Cl_2$ to form $PCl_5$ and $X$. At $723 \ K$,$HCl$ gas reacts with $O_2$ in the presence of $CuCl_2$ to form water and $Y$. $Y$ reacts with $X$ in water to form two acids $A$ and $B$. What are $A$ and $B$ respectively?

Which of the following is prepared by the electrolytic method?