Chemistry - CHEMICAL BONDING Question with Solution | TestHub

The question asks to identify the molecule/ion that is NOT non-linear, meaning it is linear.

A. $[I(CN{)}_2{]}^{-}$: The central iodine atom has two bonding pairs (to CN groups) and three lone pairs. This results in a trigonal bipyramidal electron geometry and a linear molecular geometry.

B. $H{N}_3$: This is hydrazoic acid, which has a bent structure around the central nitrogen, making it non-linear.

C. $C{H}_{3}NCS$: Methyl isothiocyanate has a bent geometry around the nitrogen and sulfur atoms, making the overall molecule non-linear.

D. $I_3^{+}$: The central iodine atom has two bonding pairs and two lone pairs, resulting in a bent molecular geometry, making it non-linear.

Therefore, $[I(CN{)}_2{]}^{-}$ is the linear species.

The final answer is $\boxed{A}$