Question

What r the limitations of VBT (valence bond theory)?

Answer 1

Limitations of valence bond theory:

1. It failed to explain the nature of attractive forces during formation of a covalent bond.
2. It failed to predict the geometry of covalent molecules like H₂O, CH₄ etc.
3. It did not explain the existence of paramagnetic molecules like O₂, NO, NO₂
4. It did not explain the formation of coordinate bond
5. It failed to explain the formation of odd electron molecules or ions
6. It failed to explain the bonding in electron deficient molecules like B₂H₆.