Question

write the limitations of valence bond theory ​

Answer 1

Explanation:

Limitations of Valence Bond Theory

No insight offered on the energies of the electrons. The theory assumes that electrons are localized in specific areas. It does not give a quantitative interpretation of the thermodynamic or kinetic stabilities of coordination compounds. No distinction between weak and strong ligands.

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Answer 2

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i. V.B. Theory explains only the formation of covalent bond in which a shared pair of electrons comes from two bonding atoms. However, it offers no explanation for the formation of a co-ordinate covalent bond in which both the electrons are contributed by one of the bonded atoms.

ii. Oxygen molecule is expected to be dimagnetic according to this theory. The two atoms in oxygen molecule should have completely filled electronic shells which give no unpaired electrons to the molecule making it diamagnetic. However, experimentally the molecule is found to be para-magnetic having two unpaired electrons. Thus, this theory fails to explain paramagnetism of oxygen molecule.

iii. Valence bond theory does not explain the bonding in electron deficient molecules like B.H in which the central atom possesses less number of electrons than required for an octet of electron