The type of hybrid orbitals used by chlorine atom in ${{\mathrm{ClO}}_3}^{-}$ is

The correct order of hybridisation of the central atom in the following species

${\mathrm{NH}}_3, {[{\mathrm{PtCl}}_4{]}_2}^{-}, {\mathrm{PCl}}_5$and ${\mathrm{BCl}}_3$is

Consider the following molecules or ions :

$\left(\mathrm{i}\right) {\mathrm{CH}}_2{\mathrm{Cl}}_2 \left(\mathrm{ii}\right) {{\mathrm{NH}}_4}^{+} \left(\mathrm{iii}\right) {{\mathrm{SO}}_3}^{2-} \left(\mathrm{iv}\right) {{\mathrm{ClO}}_4}^{-} \left(\mathrm{v}\right) {\mathrm{NH}}_3$

${\mathrm{sp}}^3$ hybridisation is involved in the formation of