$C l_{2}+H_{2} O \rightarrow H C l+H O C l$
$H O C l \rightarrow H C l+[O]$
Oxidising property is due to nascent oxygen
$3 \mathrm{HClO} \rightarrow 2 \mathrm{HCl}+\mathrm{HClO}_{3}$
$\mathrm{Cl}_2 \mathrm{O}_7, \mathrm{CO}, \mathrm{PbO}_2, \mathrm{~N}_2 \mathrm{O}, \mathrm{NO}, \mathrm{Al}_2 \mathrm{O}_3, \mathrm{SiO}_2, \mathrm{~N}_2 \mathrm{O}_5,\mathrm{SnO}_2$