Question

Number of lone pair-bond pair repulsion at ${90}^{\circ }$ are (P) in $I_3^{-}$

Answer 1

Geometry of $I_3^{-}$ is trigonal bipyramidal. As can be seen from the structure of $I_3^{-}$, number of lone pairs=$3$ which tends to occupy equitorial positions. Hence, number of bond pair- lone pair repulsion is $6$.