Question

Which of the following statement is correct about $I_3^{+}$ and $I_3^{-}$ molecular ions?

• A. Number of lone pairs at central atoms are same in both molecular ions
• B. Hybridization of central atoms in both ions are same
• C. Both are polar species
• D. Both are planar species

Answer 1

The correct option is D Both are planar species


Here the hybridisation of central atom in $I_3^{+}$ is $s{p}^3$ and it contains $2$ lone pairs on it. So, $I_3^{+}$ becomes bent shaped, planar and is polar.
The hybridisation of central atom in $I_3^{-}$ is $s{p}^{3}d$ and it contains $3$ lone pairs on it. The lone pairs are present on equatorial axis and two side $I$ atoms are present on axial axis. So, $I_3^{-}$ becomes linear shaped, planar and is non-polar.