JEE Main · 2026 · 22 Jan 2026 · Shift 2 · Coordination Compounds

Because $[\mathrm{Ni}(\mathrm{PP}{\mathrm{h}}_3{)}_2\mathrm{C}{\mathrm{l}}_2]$ is paramagnetic it is tetrahedral, with $\mathrm{N}{\mathrm{i}}^{2+}$ ($d^8$) arranged as $e^4{t}_2^4$ and carrying two unpaired electrons. A tetrahedral $\mathrm{M}{\mathrm{A}}_2{\mathrm{B}}_2$ complex shows no geometrical isomerism, so statement A is incorrect, and a $d^8$ tetrahedral nickel(II) complex is coloured (blue), so calling it white in statement B is incorrect. The spin-only moment $\mu =\sqrt{2(2+2)}=2.83\mathrm{BM}$ makes statement C correct, while the crystal field stabilisation is $4(-0.6{\Delta }_t)+4(+0.4{\Delta }_t)=-0.8{\Delta }_t$, so quoting it as $-0.8{\Delta }_0$ in statement D is incorrect. The arrangement matches that of tetrahedral $\mathrm{Ni}(\mathrm{CO}{)}_4$, so statement E is correct, and the incorrect statements are A, B and D only.