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What are the limitations of VB theory?...

What are the limitations of VB theory?

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Limitatins of VB theory
(i) It does not explain the colour of the complex
(ii) It considers the spin only magnetic moments and does not consider the other components of magnetic moments
(iii) It does not provide a quantitative explanation as to why certain complex are inner orbital complexex and the others are outer orbital complex for the same metal .For example .`[Fe(CN)_6]^(4-) ` is diamagnetic (low spin )whereas `[FeF_6]^(4-) ` is paramagnetic (high spin .
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