Sigma and pi

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Adam Enomoto 1L
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Sigma and pi

Postby Adam Enomoto 1L » Wed Nov 15, 2017 12:50 pm

In every double bond, is it always 1 sigma and 1 pi bond?

Alex Nechaev 1I
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Joined: Fri Sep 29, 2017 7:04 am

Re: Sigma and pi

Postby Alex Nechaev 1I » Wed Nov 15, 2017 12:54 pm

Yes. A single bond such as (C-H) has one sigma bond whereas a double (C=C) and triple (C≡C) bond has one sigma bond with remaining being pi bonds.

Mitch Mologne 1A
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Re: Sigma and pi

Postby Mitch Mologne 1A » Wed Nov 15, 2017 2:09 pm

Yes and this is due to the molecule having a non-hybrid p orbital.

Erik Khong 2E
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Joined: Fri Sep 29, 2017 7:07 am

Re: Sigma and pi

Postby Erik Khong 2E » Sun Nov 26, 2017 10:18 pm

Yes because the first bond is always a sigma bond and any other subsequent bonds are pi bonds.

Lorie Seuylemezian-2K
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Re: Sigma and pi

Postby Lorie Seuylemezian-2K » Tue Nov 28, 2017 6:30 pm

Is the single sigma bond always the "center" bond?

Sophie 1I
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Re: Sigma and pi

Postby Sophie 1I » Wed Nov 29, 2017 7:09 pm

Sigma bonds are always the first bonds to form and are single bonds and the remaining bonds are pi bonds. In an example of N2, the 2 pi bonds will appear to surround the single sigma bond when the electron densities of the pi bonds combine.

DAllaf
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Re: Sigma and pi

Postby DAllaf » Sat Dec 02, 2017 10:12 pm

Yes, every double bond has 1 sigma and 1 pi bond. The first bond is always sigma and then subsequently they are pi bonds. So single bonds have 1 sigma bond, double bonds have 1 sigma and 1 pi, and tripe bonds have 1 sigma and 2 pi bonds.

Jesus Rodriguez 1J
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Re: Sigma and pi

Postby Jesus Rodriguez 1J » Sun Dec 03, 2017 10:28 am

Yes, every first bond is a sigma bond and the rest of the bond that follow(like the 2nd bond in a double bond) are pi bonds.

Troy Tavangar 1I
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Re: Sigma and pi

Postby Troy Tavangar 1I » Thu Dec 07, 2017 11:46 pm

Yes, the first bond is always a sigma bond and each additional bond is a pi bond. For example, a triple bond would contain 1 sigma bond and 2 pi bonds.

QuincyH1G
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Re: Sigma and pi

Postby QuincyH1G » Sun May 27, 2018 6:05 pm

Why do they form in that order?

Amanda 1A
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Joined: Fri Apr 06, 2018 11:01 am

Re: Sigma and pi

Postby Amanda 1A » Sun May 27, 2018 7:08 pm

sigma bonds result from the formation of a molecular orbital by the head-to-head overlap of atomic orbitals, and pi bonds result by side-to-side overlap (with p orbitals). pi bonds can only happen when the head to head overlapping of orbitals has also already occurred. however, a sigma bond can happen without side-to-side overlap.

princessturner1G
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Joined: Fri Apr 06, 2018 11:05 am

Re: Sigma and pi

Postby princessturner1G » Sun May 27, 2018 8:31 pm

Yes, a double bond is one sigma plus one pi bond. While a triple bond is a sigma bond plus two pi bonds.

Anthony Mercado 1K
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Re: Sigma and pi

Postby Anthony Mercado 1K » Sun May 27, 2018 9:20 pm

If every double bond is one sigma and one pie bond, why not simply denote double bonds as such since the beginning? Or is this statement not reversible, in which a sigma and pie bond together do not always make a double bond?


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