Describe the limitations of valence bond theory.
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The theories and laws that came before this also had certain limitationson them resulting in their failure. However, the theory is also not perfect and does have its shortcomings. TheLimitations of Valence Bond Theoryare: It fails to explain the tetravalency of carbon.
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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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