The correct shape and $\mathrm{I}-\mathrm{I}-\mathrm{I}$ bond angles respectively in ${\mathrm{I}}_3^{-}$ ion are:

Which of the following are isostructural pairs?

A. ${\mathrm{SO}}_4^{2-}$ and ${{\mathrm{CrO}}_4}^{2-}$

B. ${\mathrm{SiCl}}_4$ and ${\mathrm{TiCl}}_4$

C. ${\mathrm{NH}}_3$ and ${\mathrm{NO}}_3^{-}$

D. ${\mathrm{BCl}}_3$ and ${\mathrm{BrCl}}_3$

Match List-I with List-II

Choose the correct answer from the options given below:

The number of lone pairs of electrons on the central $\mathrm{I}$ atom in ${\mathrm{I}}_3^{-}$ is