COMEDK2015ChemistryCoordination Compounds
Among the complexes of Ni listed below, the following is the only correct statement about the given compounds. I. [ Ni ( CO )₄ ] II. [ Ni ( CN )₄ ]²⁻ III. [ NiCl ₄ ]²⁻
Options
- Aall of them have tetrahedral geometry.
- BI and III are tetrahedral and II has square planar geometry.
- CI and II are tetrahedral and III is square planar.
- Dall of them have square planar geometry.
Correct answer
B. I and III are tetrahedral and II has square planar geometry.
Step-by-step solution
₂₈ Ni =3 d⁸ 4 s² In [ Ni ( CO )₄ ], CO is a strong field ligand which causes pairing of electrons. In [ Ni ( CN )₄ ]²⁻, CN ⁻ is a strong field ligand which causes pairing of electrons. In [ NiCl ₄ ]²⁻, Cl ⁻ is a weak field ligand, so no pairing of electrons takes place.