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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