Which of the following complexes are not correctly matched with the hybridisation of their central metal ion ?
(a) `[Ni(CO)_4]` , `sp^(3)` (b) `[Ni(CN)_4]^(2-)` , `sp^(3)`
(c ) `[CoF_6]^(3-)` , `d^(2)sp^(3)` (d) `[Fe(CN)_6]^(3-)` , `sp^(3)d^(2)`
Select the correct option :

Options

A. (i) and (ii)
B. (i) and (iii)
C. (ii) and (iv)
D. (ii),(iii) and (iv)

Answer

D

Explanation

Valence shell electronic configuration of

`F^(-)` is a weak field ligand, it cannot cause forcible pairing of electrons within d-subshell and thus forms outer orbital octahedral complexes.
CO and `CN^(-)` are strong field ligands, so they can form inner orbital octahedral complexes after forcible pairing of electrons withing d subshell.