Question

What are the limitations of VSEPR theory and valence bond theory

Answer 1

Limitations of VSEPR theory:

1.VSEPR Theory fails to explain isoelectronic species.
2. Isoelectronic species refers to the elements that have same number of electrons.
3.According to VSEPR theory, a shape of the molecule depends on the number of bond pair and a lone pair (valence electrons).But, isoelectronic species can differ in the shape even if they have a same number of electrons.
4.VSEPR Theory does not explain the transition metal compounds. The VSEPR model fails to guess the structure of certain compounds. The reason being that it does not take associated sizes of the substituent’s and inactive lone pairs into account.
Limitations of Valence Bond Theory:
1. It fails to explain the tetravalency of carbon.
2.This theory does not discuss about energies of electrons.
3.The assumptions about the electrons being localized to specific locations.

Answer 2

Answer:

Explanation:Limitations of VSEPR theory:

1.VSEPR Theory fails to explain isoelectronic species.

2. Isoelectronic species refers to the elements that have same number of electrons.

3.According to VSEPR theory, a shape of the molecule depends on the number of bond pair and a lone pair (valence electrons).But, isoelectronic species can differ in the shape even if they have a same number of electrons.

4.VSEPR Theory does not explain the transition metal compounds. The VSEPR model fails to guess the structure of certain compounds. The reason being that it does not take associated sizes of the substituent’s and inactive lone pairs into account.

Limitations of Valence Bond Theory:

1. It fails to explain the tetravalency of carbon.

2.This theory does not discuss about energies of electrons.

3.The assumptions about the electrons being localized to specific locations.