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Limitations of Valence Bond Theory

In coordinati...

Question

In coordination compound, the valence bond theory does not explain :

A

Stability of a complex

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B

Colour of a complex

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C

Variation of magnetic properties with temperature of a compound

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D

Shape of a compound

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Solution

The correct options are
B Colour of a complex
C Variation of magnetic properties with temperature of a compound
Valence bond theory can predict the shape and stability of the complex. However it does not explain electronic spectra of the complexes which are used to explain color of the complexes.
For some complexes, magnetic moment varies with temperature, which could not explained by valence bond theory.

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Similar questions

Q. With reference to valence Bond Theory in coordination compounds which of the following statement is/are correct?
I. VBT does not explain the colour exhibits by coordination compounds.
II. VBT explains and gives a quantitative interpretation of magnetic data.
III. VBT does not distinguish between weak field ligand and strong field ligand.

Q. Valence bond theory explains the colour of the coordination compounds.

Q. One of the most important properties of d-block metal cations is the formation of coordinate compounds. Widely used theories that explain bonding in these compounds are valence bond theory and crystal field theory.
The pair of complex ions which have the same value of magnetic moments is:

Q. Crystal field theory does not explain which of the following property of coordination compounds ?

Valence bond theory describes the bonding in complexes in terms of coordinate-covalent bonds resulting from the overlap of filled ligand orbitals with vacant metal hybrid orbitals. This theory explains the magnetic behavior and geometrical shape of coordination compounds. The magnetic moment of a complex compound can be determined experimentally and theoretically by using spin only formula.

Magnetic moment =

\sqrt{n (n + 2)}

B.M. (where n = No. of unpaired electrons}.

The value of spin only magnetic moment for an octahedral complex of the following configuration is 2.84 B.M. The correct statement is :

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