Q. Example on Crystal field splitting in octahedral complexes?

Here four ligands lie in one plane and the other two in a plane perpendicular to the first plane. Six ligands are at the comers of a regular octahedron and they all lie along the three perpendicular axes, s, y and:. Thus we see that all those orbitals which lie in the direction of these axes will experience a stronger force of repulsion as compared to the orbitals which lie between the axes.

The d_x2 - y² and d_Z2 orbitals which fie along the axes will be repelled more by the ligands and will be higher in energy than d_xy, d_yz and d_X set of orbitals.