Identifying sigma & pi bonds

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904901860
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Joined: Mon Jan 08, 2018 8:16 am

Identifying sigma & pi bonds

Postby 904901860 » Wed Dec 05, 2018 9:25 am

Just to clarify, when there is a double bond one of the bonds is a pi bond and the other is sigma bond correct? Also, when drawing this, would we draw intersecting pi bonds on the molecule?

Nicoline Breytenbach 3D
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Re: Identifying sigma & pi bonds

Postby Nicoline Breytenbach 3D » Wed Dec 05, 2018 11:02 am

Yes, double bonds contain one sigma bond and one pi bond

Madison Gil 3D
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Joined: Fri Sep 28, 2018 12:23 am

Re: Identifying sigma & pi bonds

Postby Madison Gil 3D » Wed Dec 05, 2018 11:19 am

single bond - one sigma bond
double bond - one sigma, one pi bond
triple bond - one sigma, two bi bonds
I don't think we'd need to know how to draw it, but just need to be able to identify it.

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

Re: Identifying sigma & pi bonds

Postby annaspain » Wed Dec 05, 2018 11:19 am

Yes- sigma bonds are always single bonds. So, in a double bond there will be 1 sigma bond and 1 pi bond, and in a triple bond there will be 1 sigma bond and 2 pi bonds. I don't believe we will have to draw this, but basically in a sigma bond the orbitals overlap end-to-end and in a pi bond they overlap side-by-side (which explains why pi bond prevents rotation).

Joaquin Andrade
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Joined: Fri Sep 28, 2018 12:27 am

Re: Identifying sigma & pi bonds

Postby Joaquin Andrade » Wed Dec 05, 2018 11:39 am

When drawing the bonds, make sure to emphasize the overlap between the orbitals. The pi bond will be side to side, which is why these bonds lock two molecules into place as opposed to sigma bonds which are side to side and allow molecules to rotate.


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