Answer:
The strength of a covalent bond
depends upon the extent of the overlap. Greater the overlap, stronger is the
bond. A sigma bond is formed by the axial overlap of the orbitals while pi bond
by their sidewise or lateral overlap. Since the axial overlap is more effective
than the sidewise overlap, greater energy is will be released in the axial
overlap as compared to sidewise overlap. Therefore, sigma bond a stronger than
the pi bond.
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