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)

Explanation

`Ni(CO)_(4)=sp^(3), [Ni(CN)_(4)]^(2-)=dsp^(2)`,
`[CoF_(6)]^(3-)=sp^(3)d^(2),[Fe(CN)_(6)]^(3-)=d^(2)sp^(3)`.
[`Fe^(-)` is a weak ligand and cannot force d electrons to pair up forming outer orbital complex).