What is valance bond theory?
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Yogita Ingle 7 years, 1 month ago
Valence bond theory:
Assumptions of valence bond theory:
(i) It does not give quantitative interpretation of magnetic data.
(ii) It does not explain the colour exhibited by coordination compounds.
(iii) It does not give a quantitative interpretation of the thermodynamic or kinetic stabilities of coordination compounds.
(iv) It does not make exact predictions regarding the tetrahedral and square planar structures of 4-coordinate complexes.
(v) It does not distinguish between weak and strong ligands.
According to this theory, the metal atom or ion under the influence of ligands can use its (n − 1)d, ns, np or ns, np or nd orbitals for hybridisation to yield a set of equivalent orbitals of definite geometry such as octahedral, tetrahedral and square planar.
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