Question

Limitation of valence bond theory for covalently bonded molecules

Answer 1

Explanation:

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• Limitations of Valence Bond Theory
• They are:
• It fails to explain the tetravalency of carbon.
• This theory does not discuss the electrons' energies.
• The assumptions are about the electrons being localized to specific locations.
• Postulates of Valence Bond Theory
• Postulates of Valence Bond TheoryThis gives the property of stability to the molecule.
• In case the atomic orbitals possess more than one unpaired electron, more than one bond can be formed and electrons paired in the valence shell cannot take part in such a bond formation.
• A covalent bond is directional.

Answer 2

Answer:

(1) Valence bond theory explains the formation of a covalent bond formed by sharing of a pair of electrons between two bonding atoms. But does not explain the formation of a co-ordinate covalent bond.

(2) The paramagnetic character of O_2, molecule cannot be explained.

(3) It does not explain the bonding and stability of electron deficient molecules like B_2.H_6.