The maximum number of lone pairs of electron on the central atom from the following species is ...... ClO 3…

${{\mathrm{ClO}}_3}^{-}$: The central atom is $\mathrm{Cl}$, there is one lone pair of electrons on the central atom.

${\mathrm{XeF}}_4$: The central atom is $\mathrm{Xe}$. It has two lone pair on central atom.

${\mathrm{SF}}_4$: The central atom is$\mathrm{S}$. It contains one lone pair on central atom.

${{\mathrm{I}}_3}^{-}$: It contains three lone pair on central atom.