Biology, asked by arjun6561, 1 year ago

one drawback of valency theory

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Answered by nikkuchauhan
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Postulates of Valence Bond Theory

The Valence Bond Theory postulatescertain assumptions and facts that go on to establish certain premises and facts which lead to the conclusion and assertion of the Theory to be true.The overlapping of two half-filled valence orbitals of two different atoms results in the formation of the covalent bond. Due to overlapping, the electron density between two bonded atoms increases and this gives stability to the molecule.In case the atomic orbitals possess more than one unpaired electron, more than one bond can be formed and electrons paired in the valence shell cannot take part in such a bond formation.A covalent bond is directional and it is parallel to the region of overlapping atomic orbitals.Based on the pattern of overlapping, there are two types of covalent bonds: sigma bond and a pi bond. The covalent bond formed by sideways overlapping of atomic orbitals is known as pi bond whereas the bond formed by overlapping of atomic orbital along the inter nucleus axis is known as a sigma bond.

Limitations of Valence Bond Theory

The theories and laws that came before this also had certain limitations on them resulting in their failure. However, the theory is also not perfect and does have its shortcomings. The Limitations of Valence Bond Theory are:

It fails to explain the tetravalency of carbon.This theory does not discuss the energies of electrons.The assumptions about the electrons being localized to specific locations.

To follow more on this, Check Valence Bond Theory in Coordination Compound.


Practise This Question

Which of the following represents s - s, s - p and p - p overlap respectively?



I, II, III

III, II, I

I, III, II

II, III, I

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Practise This Question

Which of the following compounds does not have molecular plane as nodal plane for its π - electron cloud?

CH2 = CH2

C6H6

CH2 = C = CH2

All of the above

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