Chemistry - Coordination Chemistry Question with Solution | TestHub

The correct option is (C).

Hybridization & Geometry: In $[Ni(pn{)}_2]C{l}_2$, $N{i}^{2+}$ is a $d^8$ system surrounded by strong-field chelating ligands, resulting in $ds{p}^2$ hybridization and a square-planar geometry.

Magnetic Property: Due to pairing of electrons in $ds{p}^2$ hybridization, it is diamagnetic with a magnetic moment of 0 B.M.

EAN Rule: The Effective Atomic Number is $EAN=28-2+2(4)=34$, which does not satisfy Sidgwick's rule (36).

Isomerism: Because 'pn' (propylenediamine) is an unsymmetrical bidentate ligand, the square-planar complex lacks a plane of symmetry and exhibits optical isomerism.