MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryCoordination compoundsValence Bond Theory

Which one of the following has a square planar geometry? (At. no. Co = 27, Ni = 28, Fe = 26, Pt = 78)

A.[CoCl4]2–

B.[FeCl4]2–

C.[NiCl4]2–

D.[PtCl4]2–✓ Correct

Explanation

Cl– is a weak field ligand Hence, the compounds having chlorine is generally a high spin complex and the CFSE of the transition metal complexes is in the order 3d<4d<5d which means that the metal belong to high in the series will form a low spin complex. Among the given complexes Pt will form a low spin complex. Hence, the correct answer is option (d)

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