Question

# Which of the following has a square planar geometry?

A
[PtCl4]2
B
[CoCl4]2
C
[FeCl4]2
D
[NiCl4]2

Solution

## The correct option is A $$[PtCl_4]^{2-}$$We know that $$Cl^{-}$$ is a weak field ligand so the maximum of the chloride complexes are high spin complexes. CFSE order for the transition metals $$3d<4d<5d$$, so metals of higher series prefer to form the low spin complex. Hence $$Pt$$ forms low spin complex, involving the inner d orbital. Hybridisation of $$Pt$$ in the complex is $$dsp^{2}$$. Hence it has square planar geometry. Option A is correct.Chemistry

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