Write limitations of valence bond theory.
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LIMITATIONS OF VALENCE BOND THEORY
(i) It involves a number of assumptions.
(ii) It does not give quantitative interpretation of magnetic data.
(iii) It does not distinguish between weak and strong ligands.
(iv) It does not explain the colour exhibited by complexes.
(v) It does not give an exact explanation of thermodynamic or kinetic stabilities of coordination compounds.
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(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.
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