pi vs sigma


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Arshia Ramesh 1G
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Joined: Fri Sep 28, 2018 12:18 am

pi vs sigma

Postby Arshia Ramesh 1G » Wed Nov 28, 2018 11:30 am

i read on one of the reviews that a pi bond is weaker than a sigma bond but why is that?

Sophia_Kiessling_2L
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Re: pi vs sigma

Postby Sophia_Kiessling_2L » Wed Nov 28, 2018 11:31 am

because if a pi bond rotates then the bond immediately breaks

Lauren Huang 1H
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Joined: Fri Sep 28, 2018 12:16 am

Re: pi vs sigma

Postby Lauren Huang 1H » Wed Nov 28, 2018 11:38 am

The head of the sigma bonds overlap directly while the pi bonds overlap laterally since they are parallel to each other, so it is easier to break the pi bonds.

timschaeffer Dis 1J
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Re: pi vs sigma

Postby timschaeffer Dis 1J » Wed Nov 28, 2018 11:44 am

A pi bond's relative weakness can also be explained by the fact that, due to the parallel orientation of the p-orbitals involved in a pi bond, there is significantly less overlap between orbitals. sigma bonds, on the other hand, form bonding orbitals directly between the nuclei of the bonding atoms, resulting in greater overlap and a stronger bond.

Kassidy Tran 1E
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Joined: Fri Sep 28, 2018 12:15 am

Re: pi vs sigma

Postby Kassidy Tran 1E » Wed Nov 28, 2018 11:47 am

There is less overlap in a pi bond than a sigma bond, since the orbitals are parallel to each other. Since there is more overlap in a sigma bond, sigma bonds are stronger than pi bonds.

Arshia Ramesh 1G
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Joined: Fri Sep 28, 2018 12:18 am

Re: pi vs sigma

Postby Arshia Ramesh 1G » Sun Dec 02, 2018 6:05 pm

okay thank you so much!!!

chris_tsai_4H
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Re: pi vs sigma

Postby chris_tsai_4H » Sun Dec 02, 2018 7:23 pm

Pi bonds are side side while sigma bonds are end to end. Therefore sigma bonds are inherently stronger. Also, when pi bonds rotate, they break, so they are weak.

taryn_baldus2E
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Joined: Fri Sep 28, 2018 12:24 am

Re: pi vs sigma

Postby taryn_baldus2E » Sun Dec 02, 2018 7:58 pm

This is because pi bonds, unlike sigma bonds, are unable to rotate, meaning that they will break more easily in a chemical reaction.

Sapna Ramappa 1J
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Joined: Fri Sep 28, 2018 12:24 am

Re: pi vs sigma

Postby Sapna Ramappa 1J » Wed Dec 05, 2018 4:34 pm

The end-to-end overlap of the sigma bond is far more significant than the side-to-side overlap of the pi bond. As a result, the sigma bond is stronger.

Jack Hewitt 2H
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Joined: Fri Sep 28, 2018 12:27 am

Re: pi vs sigma

Postby Jack Hewitt 2H » Thu Dec 06, 2018 6:00 pm

Arshia Ramesh 1G wrote:i read on one of the reviews that a pi bond is weaker than a sigma bond but why is that?

It is because a pi bond does not allow for rotation and would break while a sigma bond does allow for rotation.

Mark 1D
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Re: pi vs sigma

Postby Mark 1D » Fri Dec 07, 2018 8:30 pm

Sigma bonds overlap more than pi bonds, allowing for more strength whilst also allowing for rotation

305117729
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Joined: Fri Sep 28, 2018 12:16 am

Re: pi vs sigma

Postby 305117729 » Fri Dec 07, 2018 10:08 pm

sigma bonds are formed by two orbitals overlapping at one point, but pi bonds are formed by overlapping at two points, each one is weaker than the single one point, so easier to break pi bonds.

Divya Pimparkar 1E
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Joined: Fri Sep 28, 2018 12:19 am

Re: pi vs sigma

Postby Divya Pimparkar 1E » Fri Dec 07, 2018 10:19 pm

ya a pi bond is weaker because it cant rotate the same way a sigma bond can.


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