MHT CET Medical202624 April 2026Morning ShiftChemistryCoordination CompoundsActual
Identify the geometry and magnetic behavior of the complex [ Ni ( CO )₄] .
Options
- Asquare planar geometry and diamagnetic
- Btetrahedral geometry and diamagnetic
- Csquare planar geometry and paramagnetic
- Dtetrahedral geometry and paramagnetic.
Correct answer
B. tetrahedral geometry and diamagnetic
Step-by-step solution
The oxidation state of Ni in [ Ni ( CO )₄] is 0 . The electronic configuration of Ni (0) is [ Ar ] 3d^8 4s^2 . Since CO is a strong field ligand, it causes the pairing of electrons. The two 4s electrons are forced into the 3d orbitals, resulting in a completely filled 3d¹⁰ configuration. The empty 4s and three 4p orbitals undergo sp^3 hybridization to accommodate the four electron pairs from the four CO ligands. Due to sp^3 hybridization, the geometry of the complex is tetrahedral. Since all electrons are paired, t