ii) When `Delta_(0) gt P`, the electrons get paired up in the lower `t_(2g)` orbitals. The electronic configuration of `d^(4)` ion is: `t_(2g)^(2)e_(g)^(0)`.
iii) The complex is octahedral since the didenate ligands are attached to the `M^(n+)` ion which is `d^(2)sp^(3)` hybridised.
iv) The complex will exhibit optical isomerism.