Which of the following complexes are not correctly matched with the hybridisation of their central metal ion?
(i) `[Ni(CO)_4], sp^3` (ii) `[Ni(CN)_4]^(2-), sp^3` (iii) `[CoF_6]^(3-) , d^2 sp^3`
(iv) `[Fe(CN)_6]^(3-), sp^3 d^2`
Select the correct answer using the codes given below:

Options

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

Answer

D

Explanation

`Ni(CO)_4 =sp^3, [Ni(CN)_4]^(2-) = dsp^2, [CoF_6]^(3-) = sp^3d^2, [Fe(CN)_6]^(3-) = d^2sp^3`
(`F^(-)` is a weak ligand and cannot force d electrons to pair up forming outer orbital complex).