question_answer

Which of the following complexes is not correctly matched with their geometries?

A) \[{{[CoC{{l}_{2}}]}^{2-}}-\]tetrahedral

B) \[[Co\,{{(PM{{e}_{3}})}_{4}}]-\]tetrahedral

C) \[{{[Co\,{{(CN)}_{4}}]}^{3\,-}}-\] tetrahedral

D) \[{{[Fe\,{{(CO)}_{4}}]}^{2\,-}}-\]square planar

Correct Answer: D

Solution :

A, B and C are correctly matched.

[d] - tetrahedral, CO stronger ligand, so pairing of electrons occurs, (source C.W.M.B).