Why is more energy required to break a sigma bond than to break a pi bond?

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Solution

In sigma bonds end-on overlap takes place it means sigma bonds form directly between the two nuclei. Hence force of attraction will be more.
Whereas in $π$ bonds side on overlap takes place. It means nuclei are far from electrons in this bond. Hence, force of attraction will be less.
So, Sigma bonds require more energy than $π$ bonds to break.

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