Coordination CompoundHard

Question

Which of the following complex is not correctly matched with its geometry ?

Options

A.[NiCl2(Ph3P)2] - tetrahedral
B.[Co(Py)4]2+ - square planar.
C.[Cu(CN)4]3- - tetrahedral
D.[Fe(CO)4]2- - square planar.

Solution

In complex the iron is in -2 oxidation state. CO is strong field ligand and, therefore pairing of electrons occurs. So,
[Fe(CO)4]2  : 

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