Crystal field theory (CFT) considers ligands as point charges and focuses on the electrostatic interaction between metal and ligand.
CFT is successful in explaining:
II. Formation and structures of complexes
III. Colour (due to d-d transition)
IV. Magnetic properties (due to electron pairing/unpairing in d orbitals)
It does not explain I (ligands as point charges is an assumption, not an outcome)
It also fails to explain V (covalent character), which is covered by Molecular Orbital Theory
Match List - I with List - II:
List - I:
(A) \([ \text{MnBr}_4]^{2-}\)
(B) \([ \text{FeF}_6]^{3-}\)
(C) \([ \text{Co(C}_2\text{O}_4)_3]^{3-}\)
(D) \([ \text{Ni(CO)}_4]\)
List - II:
(I) d²sp³ diamagnetic
(II) sp²d² paramagnetic
(III) sp³ diamagnetic
(IV) sp³ paramagnetic