## Pi and sigma bonds

$sp, sp^{2}, sp^{3}, dsp^{3}, d^{2}sp^{3}$

Indy Bui 1l
Posts: 99
Joined: Sat Sep 07, 2019 12:19 am

### Pi and sigma bonds

Can someone explain why a a single bond is a sigma and why a double bond has a sigma and a pi bond, and the same for triple bonds? thanks

sbeall_1C
Posts: 109
Joined: Sat Sep 07, 2019 12:17 am
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### Re: Pi and sigma bonds

Sigma bonds refer to the s-orbital, and occur when two orbitals are overlapping end to end. Sigma bonds have no nodal planes containing the internuclear axis. This is the reason why a single bond contains one sigma bond. A pi bond refers to a p-orbital, and occurs when two orbitals overlap side to side. Pi bonds have a single nodal plane and contain the internuclear axis.

Naren_Ramesh_4F
Posts: 105
Joined: Sat Aug 17, 2019 12:18 am

### Re: Pi and sigma bonds

I believe Dr. Lavelle will be going over it in the 11/18 lecture.

Fatemah Yacoub 1F
Posts: 114
Joined: Thu Jul 11, 2019 12:16 am

### Re: Pi and sigma bonds

A sigma bond almost always forms first so automatically a multiple bond will have one sigma bond. Since pi bonds overlap side by side that is why they form on multiple bonds. Therefore any multiple bond will have one sigma bond and then either 1 or 2 pi bonds.

BCaballero_4F
Posts: 94
Joined: Wed Nov 14, 2018 12:22 am

### Re: Pi and sigma bonds

Because a sigma bond is stronger and more stable so there will be one of these, and pi bonds would come after the sigma bond because they are weaker.