Pi and Sigma bonds

(Polar molecules, Non-polar molecules, etc.)

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Dakota Walker 1L
Posts: 58
Joined: Wed Sep 18, 2019 12:17 am

Pi and Sigma bonds

Postby Dakota Walker 1L » Tue Nov 19, 2019 1:26 am

Can someone explain any general rules about using pi and sigma bonds? I understand how they overlap either end to end or sideways but do you have to draw out the entire 3D structure to figure this out? Or is there a rule deciding how many pi/sigma bonds are in molecules?

905416023
Posts: 54
Joined: Thu Jul 25, 2019 12:17 am

Re: Pi and Sigma bonds

Postby 905416023 » Tue Nov 19, 2019 1:31 am

It depends on how many bonds there are. 1 bond=1isgma bond. 2bonds=1 sigma and 1 pie. 3bonds=1 sigma and 2 pie

JinwooLee_1F
Posts: 47
Joined: Sat Aug 17, 2019 12:15 am

Re: Pi and Sigma bonds

Postby JinwooLee_1F » Tue Nov 19, 2019 2:06 am

The first bond is always sigma bond. The next bonds are pi bonds. For example, triple bond would be sigma bond + 2 pi bonds.

Kishan Shah 2G
Posts: 132
Joined: Thu Jul 11, 2019 12:15 am

Re: Pi and Sigma bonds

Postby Kishan Shah 2G » Tue Nov 19, 2019 8:31 am

I think the general idea behind pi and sigma bonds that we need to know is determining how many of each there are in a large molecule of some sort. So the basic rule of a single bond having 1 sigma bond, a double bond having 1 sigma and 1 pi bond, and a triple bond having 1 sigma and 2 pi bonds is useful when tying to determine this.

Sam McNeill 1E
Posts: 110
Joined: Sat Aug 24, 2019 12:17 am

Re: Pi and Sigma bonds

Postby Sam McNeill 1E » Tue Nov 19, 2019 9:45 am

Besides knowing that pi bonds are any bonds past a single bond, also know that pi bonds do not allow the molecule to rotate.

Adelpha Chan 1B
Posts: 58
Joined: Thu Jul 25, 2019 12:15 am

Re: Pi and Sigma bonds

Postby Adelpha Chan 1B » Tue Nov 19, 2019 12:10 pm

Dakota Walker 1L wrote:Can someone explain any general rules about using pi and sigma bonds? I understand how they overlap either end to end or sideways but do you have to draw out the entire 3D structure to figure this out? Or is there a rule deciding how many pi/sigma bonds are in molecules?

it is a general rule that single bonds exhibit one sigma bond, double bonds exhibit one sigma and one pi bond, and a triple bond exhibits one sigma and two pi bonds.


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