Sigma/pi bonds

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MedhaVallurupalli1F
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Sigma/pi bonds

Postby MedhaVallurupalli1F » Sun Jul 28, 2019 10:20 am

Which bond allows for rotation around the molecule, sigma or pi?

Chem_Mod
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Re: Sigma/pi bonds

Postby Chem_Mod » Sun Jul 28, 2019 10:39 am

Sigma bonds can rotate. Pi bonds can not rotate because they arise from the unhybridized p orbitals, and because of their shape they must be in the same orientation, thus restricting a rotational ability or else the bond will be broken.

Haorui Li 1A
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Joined: Mon Jun 17, 2019 7:23 am

Re: Sigma/pi bonds

Postby Haorui Li 1A » Sun Jul 28, 2019 8:18 pm

Can Pi bonds be considered just a force of attraction between electron pairs?

Chem_Mod
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Re: Sigma/pi bonds

Postby Chem_Mod » Sun Jul 28, 2019 10:57 pm

No, electrons do not attract each other as they are the same charge. Pi bonds occur when electrons are shared through side-by-side orbital overlap rather than by end-to-end orbital overlap, which results in sigma bonding instead.


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