Which of the following is not linear?

Options

A. `ICl_2^(-)`
B. `N_3^(-)`
C. `NO_2^(-)`
D. `CN_2^(-)`

Answer

C

Explanation

For linear shape, the SN of central atom of ion should be `2+0=2`, i.e., it should be bonded to two other atoms and should not possess any lone pair. Linear shape is also possible for `SN 2+3=5`.
The SN of I in `ICl_2` is `2+3=5`.
The SN of N in `N_3^(-)` is `2+0=2`.
The SN of N in `NO_2^(-)` is `2+1=3`.
The SN of C in `CN_2^(-)` is `2+0=2`.
Therefore, `NO_2^(-)` is not linear, it is angular.