JEE Main · 2007 · 29 Apr 2007 · Offline · Coordination Compounds

Which one of the following has a square planar geometry?

(A) $[CoCl_{4}]^{2 -}$
(B) $[FeCl_{4}]^{2 -}$
(C) $[NiCl_{4}]^{2 -}$
(D) $[PtCl_{4}]^{2 -}$ ✓ Correct

Answer: (D)

Solution

With the weak-field chloride ligand the tetrachlorides of

C o^{2 +}

F e^{2 +}

and

N i^{2 +}

adopt

s p^{3}

hybridisation and are tetrahedral. Platinum(II), however, is a

d^{8}

centre that almost always forms square-planar complexes through

d s p^{2}

hybridisation, even with halide ligands. Hence

[PtC l_{4}]^{2 -}

is the square-planar species among these.

JEE Main · 2007 · 29 Apr 2007 · Offline · Single correct option

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