1. Tardigrade
  2. Question
  3. Chemistry
  4. Which one of the following has a square planar geometry (At nos.: Fe = 26, Co = 27, Ni = 28, Pt = 78)

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Q. Which one of the following has a square planar geometry
(At nos.: Fe = 26, Co = 27, Ni = 28, Pt = 78)

AIEEEAIEEE 2007Coordination Compounds

Solution:

As $Cl^-$ is weak field ligand so no pairing up.
Hence it is $sp^3$ hybridized giving tetrahedral geometry.
Due to $Cl^-$, back pairing is not observed so it will be $sp^3$ hybridized giving tetrahedral geometry.
Because weak ligand, back pairing is not observed so it will be $sp^3$ i.e. tetrahedral geometry. All the complexes of $Pt^{2+}$ are square planar including those with weak field ligand such as halide ions thus (4) is correct.

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