Draw Backs Of Valance bond theory

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Valence bond theory is a fundamental approach to understand the bonding in molecules. However, it also has some limitations and drawbacks. Some of them are:
Limited applicability: The valence bond theory is applicable only to molecules with covalent bonds. It cannot explain the bonding in ionic compounds, metals, and other complex molecules.
Incomplete description: The valence bond theory describes the bonding in terms of localized electron pairs. It does not provide a complete picture of the delocalization of electrons and resonance in molecules.
Limited prediction power: The valence bond theory cannot predict the shapes and geometries of molecules accurately. It can only explain the bonding but not the molecular geometry.
Dependence on wave functions: The valence bond theory depends on the mathematical wave functions to describe the bonding. However, the wave functions can be quite complex and difficult to solve for large molecules.
Difficulty in accounting for magnetic properties: The valence bond theory cannot easily account for magnetic properties like paramagnetism and diamagnetism in molecules.
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