Question

why sigma bonds have lower energy than pi bonds ?​

Answer 1

In pi bonds, electrons are in a high-energy state, and energy is not required to break the bond because of side by side overlapping or lateral overlapping. On the contrary, sigma bonds have head-to-head overlap or axial overlap, therefore energy is required to break the bond.

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Answer 2

⏩In pi bonds, electrons are in a high-energy state, and energy is not required to break the bond because of side by side overlapping or lateral overlapping. On the contrary, sigma bonds have head-to-head overlap or axial overlap, therefore energy is required to break the bond.⏪

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