Coordination CompoundHard
Question
Which one of the following has a square planar geometry?
Options
A.[CoCl4]2-
B.[FeCl4]2-
C.[NiCl4]2-
D.[PtCl4]2-
Solution
27Co2+ - 1s2 2s2 2p63s23p63d74s0
As Cl- is weak field ligand so no pairing up.
Hence it is sp3 hybridized giving tetrahedral geometry.
Fe2+ - 1s22s22p63s23p63d64s0
Due to Cl-, back pairing is not observed so it will be sp3 hybridized giving tetrahedral geometry.
Ni2+ - 1s22s22p63s23p63d84s0
Because weak ligand, back pairing is not observed so it will be sp3 i.e. tetrahedral geometry.
All the complexes of Pt2+ are square planar including those with weak field ligand such as halide ions thus (4) is correct.
As Cl- is weak field ligand so no pairing up.
Hence it is sp3 hybridized giving tetrahedral geometry.
Fe2+ - 1s22s22p63s23p63d64s0
Due to Cl-, back pairing is not observed so it will be sp3 hybridized giving tetrahedral geometry.
Ni2+ - 1s22s22p63s23p63d84s0
Because weak ligand, back pairing is not observed so it will be sp3 i.e. tetrahedral geometry.
All the complexes of Pt2+ are square planar including those with weak field ligand such as halide ions thus (4) is correct.
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