$\left.{F}_{2}>{ClF} \text { (inter halogen }\right)>{Cl}_{2}$

$(ii)$ ${ClF}+{H}_{2} {O} \rightarrow {HOCl}+{HF}$

$(iii)$ Oxidizing power in aqueous solution

${F}_{2}>{Cl}_{2}>{Br}_{2}>{I}_{2}$