What are the demerits of valence bond theory which later explain by Molecular orbital theory. give the answer in## points ## ?please don't send any link

Dear Student,

Limitations of VBT are :
  1. It is based on many assumptions. 
  2. It fails to explain the nature of attractive forces during formation of a covalent bond. 
  3. It didnot explain the existence of paramagnetic molecules like O2,NO, NO2, etc. 
  4. The stability of molecules cannot be predicted accurately. 
These limitations were overcomed by Molecular Orbital theory. 

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According to valence bond theory we can not perfectly comment on the magnetic properties of the compound.
Like acc. To valence bond theory oxygen is diamagnetic but in real situation it attracts in the magnetic fields. Thus it is explained by molecular orbital theory.
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