What are the major drawback of Valence bond theory?

The Valence Bond theory explains the formation, structures and magnetic behaviour of coordination compounds

Valence bond theory failed to explain the tetra valency exhibited by carbon.
No insight offered on the energies of the electrons.
The theory assumes that electrons are localized in specific areas.
It does not give a quantitative interpretation of the thermodynamic or kinetic stabilities of coordination compounds.
Weak and strong ligands are not differentiated.
The colour exhibited by coordination compounds is not explained.

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