See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

Metal with d8 configuration is ideal for the formation of low spin square planar complexes with strong field ligands. Tetrahedral high spin complexes are typically formed with bulky ligands due to less steric hinderance than the square planar complex. The importance of electronic and steric balance is apparent in complexes such as   2 2 2 Ni PPh Et Br     which can be isolated as a green tetrahedral complex and also as a brown square planar complex. (C) All the complexes with   2 8 Ni d configuration  are paramagnetic owing to 2 unpaired electrons.