Which of the following has a square planar geometry?
A
[PtCl4]2−
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B
[CoCl4]2−
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C
[FeCl4]2−
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D
[NiCl4]2−
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Solution
The correct option is A[PtCl4]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 dsp2. Hence it has square planar geometry.