Coordination CompoundHard
Question
Which of the following complexes is correctly matched with their geometries ?
Options
A.[Co(py)4]2+ - square planar
B.[Cu(CN)4]3- - tetrahedral
C.[Fe(CO)4]2- - tetrahedral
D.All of these
Solution
(A) Py is strong field ligand and the complex is square planar and paramagnetic.
(B) Copper (I) has electron configuration [Ar]18 3d10. With CN- (strong field ligand) there is no empty d-orbital for dsp2 hybridisation and so the complex is tetrahedral not square planar.
(C) Iron is in -2 oxidation state and CO is strong field ligand so after rearrangement of electrons, pairing of electrons occurs. So,
[Fe(CO)4]2-
(B) Copper (I) has electron configuration [Ar]18 3d10. With CN- (strong field ligand) there is no empty d-orbital for dsp2 hybridisation and so the complex is tetrahedral not square planar.
(C) Iron is in -2 oxidation state and CO is strong field ligand so after rearrangement of electrons, pairing of electrons occurs. So,
[Fe(CO)4]2-
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