Figuring out the number of sigma and pi bonds in a molecule


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Julia Go 2L
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Figuring out the number of sigma and pi bonds in a molecule

Postby Julia Go 2L » Sun Nov 25, 2018 8:20 am

How are you able to determine the number of sigma bonds and pi bonds there are in a molecule?

In 2F.3 in the 7th edition, it asks this question for H2S and SO2. I don't know where to start to figure this out.

chris_tsai_4H
Posts: 52
Joined: Fri Sep 28, 2018 12:26 am

Re: Figuring out the number of sigma and pi bonds in a molecule

Postby chris_tsai_4H » Sun Nov 25, 2018 9:30 am

First, you should draw the lewis structures for both molecules. Then, you can see the types of bonds between each atom. Single bonds have one sigma bond, double bonds have one sigma bond and one pi bond, and triple bonds have one sigma bond and two pi bonds.

Emilee Hosking 1D
Posts: 32
Joined: Fri Sep 28, 2018 12:17 am

Re: Figuring out the number of sigma and pi bonds in a molecule

Postby Emilee Hosking 1D » Sun Nov 25, 2018 1:39 pm

For 2F3, it asks how many sigma and pi bonds are in SO2. From drawing the lewis structure I found that there are 2 sigma and 2 pi bonds. In the answer key, however it states that there is a resonance structure with 2 sigma bonds and 1 pi bond. How would these two lewis structures have resonance if one has two double bonds and the other has a double and a single bond?


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