SO2 bond sigma and pi bond

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curry 1E
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SO2 bond sigma and pi bond

Postby curry 1E » Tue Nov 19, 2019 10:03 pm

What are the sigma and Pi bonds of SO2?

Sebastian Lee 1L
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Re: SO2 bond sigma and pi bond

Postby Sebastian Lee 1L » Tue Nov 19, 2019 10:40 pm

The Lewis Structure for SO2 is a central Sulfur double bonded to each of the Oxygen atoms. A double bond consists of one sigma bond and one pi bond so in total you would have two sigma bonds and two pi bonds (one sigma and pi for one bonded Oxygen and another sigma and pi for the other).

Sebastian Lee 1L
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Re: SO2 bond sigma and pi bond

Postby Sebastian Lee 1L » Tue Nov 19, 2019 10:45 pm

Also, extra stuff not regarding the original question:

The VSEPR shape of SO2 would be bent with a bond angle of slightly less than 120 degrees. This is because there are 3 regions of electron density (trigonal planar derived) but one of them is a lone pair which repels a little more than a bonded pair would.

The sigma bonds of the molecule are between a hybrid 3sp2 orbital of Sulfur and a hybrid 2sp2 orbital of Oxygen. Sulfur's hybrid state has 3 3sp2 orbitals where 1 is full (the lone pair) and 2 only have one electron (the sigma bonding e-). Sulfur also has 2 3p orbitals which create the pi bonds with Oxygen's 2p orbitals. Oxygen has 3 2sp2 orbitals where 2 are full (lone pairs) and 1 has one e- (bonding). This leaves one electron to fill the 2p orbital which does pi bonding.

Andrew Liang 1I
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Re: SO2 bond sigma and pi bond

Postby Andrew Liang 1I » Tue Nov 19, 2019 10:46 pm

Since there are 2 double bonds in this molecule we know that there must be 2 sigma and 2 pi bonds because double bond always consists of 1 sigma and 1 pi bond

Pegah Nasseri 1K
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Joined: Wed Feb 27, 2019 12:15 am

Re: SO2 bond sigma and pi bond

Postby Pegah Nasseri 1K » Tue Nov 19, 2019 11:44 pm

In SO2, the central atom S is double bonded to each O. There are two double bonds in the structure. You know that there can only be one sigma bond in every bond. So in each double bond, there will be a sigma bond and a pi bond. In total, there will be two sigma bonds and two pi bonds.

Another thing to keep in mind is that a sigma bond is stronger than a pi bond. A double bond is stronger than a single bond because it consists of both a sigma and a pi bond so it will be harder to break than a single bond that consists of only one sigma bond.


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