The correct statements among I to III are  :

(I) Valence bond theory cannot explain the color exhibited by transition metal complexes .

(II)  Valence bond theory can predict quantitatively the magnetic properties of transition metal complexes.

(III) Valence bond theory cannot distinguish ligands as weak and strong field ones.

  • Option 1)

    II and III only 

  • Option 2)

    I  , II and III

  • Option 3)

    I and III only 

  • Option 4)

    I and II only 

Answers (1)

 

Valence bond theory ( VBT ) -

1.  It is formed by overlapping of valence shell atomic orbital of the two atoms having unpaired electron.

2.  There is maximum electron density between the bonding atoms

3.  Greater the overlapping of atomic orbital higher is the strength of chemical bond 

- wherein

 

 

Limitation of Valence bond Theory -

If does not explain

1.  Formation of chemical bond of molecules.

2.  Their relative bond length.

3.  Their characteristics magnetic properties.

4.  Their optical properties like color of molecules.

-

 

 

 

 

 

(I ) and (III) will be correct 

a) VBT  does not explain the colour exhibited by co-ordination compounds.

b)  VBT does not explain and give quantitative interpretation of magnetic data.

c)  VBT  does not distinguish between weak ligand and strong field ligand .


Option 1)

II and III only 

Option 2)

I  , II and III

Option 3)

I and III only 

Option 4)

I and II only 

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