Sigma and Pi Bonds


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Andrew F 2L
Posts: 103
Joined: Sat Aug 17, 2019 12:17 am

Sigma and Pi Bonds

Postby Andrew F 2L » Sat Nov 23, 2019 10:23 pm

To my understanding, Sigma bonds are between single bonds and are able to rotate and Pi bonds are the bonds after the first bond of a sigma bond and cannot rotate. Do we need to know anything else for these types of bonds?

Jason Wu 1E
Posts: 101
Joined: Thu Jul 25, 2019 12:15 am

Re: Sigma and Pi Bonds

Postby Jason Wu 1E » Sat Nov 23, 2019 10:24 pm

Not sure if we need to know this: but I think when reactions occur and bond breaks, the pi bonds break first before the sigma bonds and sigma bonds form before pi bonds when bonds form.

Jessica Tran_3K
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

Re: Sigma and Pi Bonds

Postby Jessica Tran_3K » Sat Nov 23, 2019 10:48 pm

I think that's all we should know

Jielena_Bragasin2G
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Joined: Sat Aug 24, 2019 12:18 am
Been upvoted: 1 time

Re: Sigma and Pi Bonds

Postby Jielena_Bragasin2G » Sat Nov 23, 2019 10:52 pm

Pi bonds interact by laying side by side whereas sigma bonds interact end to end. Sigma bonds look like a cylinder, having cylindrical symmetry around the internuclear axis while pi bonds look like two lobes on one side of the internuclear axis.

Liliana Aguas 3G
Posts: 59
Joined: Wed Sep 18, 2019 12:20 am

Re: Sigma and Pi Bonds

Postby Liliana Aguas 3G » Sat Nov 23, 2019 11:02 pm

Yes, we should just know that and how they interact as mentioned above. And how to show their interaction on a molecule.

Nicholas_Gladkov_2J
Posts: 125
Joined: Sat Aug 17, 2019 12:17 am

Re: Sigma and Pi Bonds

Postby Nicholas_Gladkov_2J » Sat Nov 23, 2019 11:20 pm

Andrew F 3B wrote:To my understanding, Sigma bonds are between single bonds and are able to rotate and Pi bonds are the bonds after the first bond of a sigma bond and cannot rotate. Do we need to know anything else for these types of bonds?


Regarding sigma and pi bonds I think that the most important things to know is that sigma bonds are present in single bonds, and pi bonds and sigma bonds are present for double bonds, and for triple bonds, two pi bonds and one sigma bond. Also, regarding pi bonds, orbitals overlap side by side, and are rigid, compared to single bonds in sigma bonds.

Bradley Whitworth 4B
Posts: 54
Joined: Sat Jul 20, 2019 12:17 am

Re: Sigma and Pi Bonds

Postby Bradley Whitworth 4B » Sun Nov 24, 2019 1:05 am

That's the main idea; I'd know how to count both in a molecule and know which breaks first (pi).

pauline young 1L
Posts: 50
Joined: Thu Jul 11, 2019 12:15 am

Re: Sigma and Pi Bonds

Postby pauline young 1L » Sun Nov 24, 2019 1:06 am

i think we just have to know how to count them, know which one is stronger, and their different interactions with the internuclear axis


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