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Question

Choose the wrong statement according to the valence bond theory:

A
A σ-bond is stronger than a π-bond
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B
p-orbitals always have only sideways overlapping
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C
s-orbitals never form π-bonds
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D
There can be only one sigma bond between two atoms
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Solution

The correct option is B p-orbitals always have only sideways overlapping
(a) σ bond is stronger than π bond, because overlapping of atomic orbitals can take place to a greater extent during the formation of sigma bond compared to the formation of a π bond.

(b) p-orbitals can form sp, pp overlapping axially also. Such bonds are called σ bonds. π bond is formed by sideways overlapping of p - orbitals.

(c) Only p and d-orbitals can form π bonds. s - orbitals always form sigma bonds.

(d) When the orbitals of an atoms undergoes head on overlapping to form a σ bond, sharing of only two electrons are possible. For more electrons to be shared, lateral orbital overlapping takes place. So, there can be only one σ bond between two atoms.

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