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pi vs sigma

Posted: Wed Nov 28, 2018 11:30 am
by Arshia Ramesh 1G
i read on one of the reviews that a pi bond is weaker than a sigma bond but why is that?

Re: pi vs sigma

Posted: Wed Nov 28, 2018 11:31 am
by Sophia_Kiessling_2L
because if a pi bond rotates then the bond immediately breaks

Re: pi vs sigma

Posted: Wed Nov 28, 2018 11:38 am
by Lauren Huang 1H
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.

Re: pi vs sigma

Posted: Wed Nov 28, 2018 11:44 am
by timschaeffer Dis 1J
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.

Re: pi vs sigma

Posted: Wed Nov 28, 2018 11:47 am
by Kassidy Tran 1E
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.

Re: pi vs sigma

Posted: Sun Dec 02, 2018 6:05 pm
by Arshia Ramesh 1G
okay thank you so much!!!

Re: pi vs sigma

Posted: Sun Dec 02, 2018 7:23 pm
by chris_tsai_4H
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.

Re: pi vs sigma

Posted: Sun Dec 02, 2018 7:58 pm
by taryn_baldus2E
This is because pi bonds, unlike sigma bonds, are unable to rotate, meaning that they will break more easily in a chemical reaction.

Re: pi vs sigma

Posted: Wed Dec 05, 2018 4:34 pm
by Sapna Ramappa 1J
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.

Re: pi vs sigma

Posted: Thu Dec 06, 2018 6:00 pm
by Jack Hewitt 2H
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.

Re: pi vs sigma

Posted: Fri Dec 07, 2018 8:30 pm
by Mark 1D
Sigma bonds overlap more than pi bonds, allowing for more strength whilst also allowing for rotation

Re: pi vs sigma

Posted: Fri Dec 07, 2018 10:08 pm
by 305117729
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.

Re: pi vs sigma

Posted: Fri Dec 07, 2018 10:19 pm
by Divya Pimparkar 1E
ya a pi bond is weaker because it cant rotate the same way a sigma bond can.