According to cystal field theory, interaction between central metal atom/ion and ligand is electrostatic in nature. In free metal ions, the five d-orbitals are degenerate. However, in a ligand field e.g., tetrahedral, octahedral, square planar, square pyramidal, trigonal bipyramidal, the degeneracy of 5d-orbitals is lost.
If lobes of d-orbitals of central metal atom/ion are along the axes through which ligands are approaching, the energy of corresponding d-orbital is raised more than the d-orbitals having lobes between teh axes. e.g., octahedral complexes, square planar complexes, square pyramidal compexes.
The correct order `Delta_(o), Delta_(t)" and "Delta_(sp)` (where o, t and sp stand for octahedral, tetrahedral and square planar fileds respectively) is :

Options

A. `Delta_(o) gt Delta_(sp) gt Delta_(t)`
B. `Delta_(sp) gt Delta_(o) gt Delta_(t)`
C. `Delta_(sp) gt Delta_(t) gt Delta_(o) `
D. `Delta_(o) gt Delta_(t) gt Delta_(sp)`

Answer

B

Explanation

`Delta_(t)=(4)/(9)Delta_(0),Delta_(sp)=1.3Delta_(0)impliesDelta_(sp) gt Delta_(0) gt Delta_(t)`