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When degenerate d-orbitals of an isolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost. The two set \( t_{2 g}\left(d_{x y}, d_{y z}, d_{x z}\right) \) and eg \( \left(d_{z^{2}}, d_{x^{2}}-y^{2}\right) \) are either stabilized or destrabilized depending upon the nature of magnetic field. It can be expressed diagrammatically as:

Value of CFSE depends upon nature of ligand and a spectrochemical series has been made experimentally, for tetrahedral complexes, \( \Delta \) is about \( 4 / 9 \) times to \( \Delta_{0} \) (CFSE for octahedral complex). This energy lies in visible region and i.e., why electronic transition are responsible for colour. Such transitions are not possible with \( \mathrm{d}^{\mathrm{O}} \) and \( \mathrm{d}^{10} \) configuration.
The d-orbitals, which are stabilised in an octahedral magnetic field, are -
(A) \( d_{x y} \) and \( d_{z^{2}} \)
(B) \( d_{x^{2}-y^{2}} \) and \( d_{z^{2}} \)
(C) \( d_{x y}, d_{x z} \) and \( d_{y z} \)
(D) \( \mathrm{d}_{z^{2}} \) only
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