Question

What are the limitations of VB theory?

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Answer 1

Answer:

(1) It cannot explain the spectral properties (colours) of the complex compounds.

(2) Even if the magnetic moments can be calculated from the number of unpaired electrons, it cannot explain the magnetic moment arising due to orbital motion of electrons.

(3) It cannot explain why the metal ions with the same oxidation state give inner complexes and outer complexes with different ligands.

(4) In every complex, it cannot explain magnetic properties based on geometry of the complex.

(5) Quantitative interpretations of thermodynamic and kinetic stabilities of the coordination compounds cannot be accounted.

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Answer 2

Answer:

the valence bond theory has the following limitations :

• (1) It cannot explain the spectral properties (colours) of the complex compounds.
• (2) Even if the magnetic moments can be calculated from the number of unpaired electrons, it cannot explain the magnetic moment arising due to orbital motion of electrons.
• (3) It cannot explain why the metal ions with the same oxidation state give inner complexes and outer complexes with different ligands.
• (4) In every complex, it cannot explain magnetic properties based on geometry of the complex.
• (5) Quantitative interpretations of thermodynamic and kinetic stabilities of the coordination compounds cannot be accounted.