Strength of bonds

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Strength of bonds

Postby ran2000 » Tue Oct 30, 2018 12:14 pm

Why are sigma bonds stronger than pi bonds?

Grace Kim 1J
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Re: Strength of bonds

Postby Grace Kim 1J » Tue Oct 30, 2018 4:31 pm

In sigma bonds, linear overlapping occurs whereas in pi bonds, parallel overlapping occurs. In pi bonds, the electron density is parallely concentrated, which results in less stronger bonds. In sigma bonds, electron density is concentrated along the x-axis.

The greater the extent of overlapping, the higher the probability of finding the valence electrons in between the nuclei, making the bond stronger and shorter. This explains why sigma bonds are stronger than pi bonds!

Below is a link of the comparison of the two bonds:

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