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Valence Bond Theory and Molecular Orbital Theory (VBT and MOT)

July 18, 2018 by Dr. IM Leave a Comment

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What is the Valence Bond Theory and Molecular Orbital Theory (VBT and MOT)?

What are the Difference between them?

Answer: VBT and MOT, VBT and MOT, VBT and MOT

Valence Bond Theory and Molecular Orbital Theory (VBT and MOT)

Valence bond theory (VBT)

  1. After the bond formation, the combining atoms in a molecule retain their identity.
  2. Bonding is explained with the help of atomic orbitals.
  3. Only the half-filled atomic orbitals of the valence shell take part in bond formation.
  4. The concept of resonance is applicable only to valence bond theory.
  5. It cannot explain the paramagnetic character of the O2 molecule.
  6. This theory finds difficulty in explaining the stability of one and three-electron bonds having unpaired electrons.
  7. VBT cannot explain the formation of O2+ and O2- ions from O2 have a stable octet.

VBT and MOT

Molecular orbital theory (MOT)

  1. After the bond formation, the combining atoms in a molecule lose their identity.
  2. It explains bonding with the help of molecular orbitals.
  3. It considers all the electrons in the atoms for the prediction of several bonds per atom.
  4. Resonance has no role in the molecular orbital theory.
  5. It explains the paramagnetic character of the O2 molecule.
  6. MOT can easily explain the formation of one electron bond and three-electron bonds.
  7. MOT can explain the formation of O2+ and O2- ions from O2.

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Filed Under: Engineering Chemistry Tagged With: Difference between Valence Bond Theory and Molecular Orbital Theory, Molecular Orbital Theory, MOT, Valence Bond Theory, Valence Bond Theory and Molecular Orbital Theory, VBT, VBT and MOT

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