Resonance

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Cecilia Cisneros 1F
Posts: 133
Joined: Wed Sep 30, 2020 9:45 pm

Resonance

Postby Cecilia Cisneros 1F » Tue Nov 17, 2020 9:05 pm

Can someone explain how the other two lewis structures are apart of the resonance structures? I thought resonance would have to be only with the lowest energy structure. In this case isn't the last one the only one that would be the lowest energy structure with all formal charges = 0. Therefore this compound would not have resonance?
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Screen Shot 2020-11-17 at 8.58.13 PM.png

Claire_Latendresse_1E
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Re: Resonance

Postby Claire_Latendresse_1E » Tue Nov 17, 2020 9:22 pm

In the picture, the last resonance structure would be the best because all of the formal charges are zero like you said. That doesn't mean that it is the actual structure, though. Every resonance structure contributes to the overall "actual" molecule. The last resonance structure will contribute more than the other two structures because of its stability due to formal charges.

magalysantos_1F
Posts: 106
Joined: Wed Sep 30, 2020 9:46 pm

Re: Resonance

Postby magalysantos_1F » Tue Nov 17, 2020 11:29 pm

Resonance does not necessarily mean the lowest energy structure. Resonance is all possible Lewis structures of a molecule, in which you can find the most stable structure (because it will have the lowest energy).

OwenSumter_2F
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Re: Resonance

Postby OwenSumter_2F » Wed Nov 18, 2020 9:44 am

To add on to what the others have said, if you are asked to give the most probable Lewis structure, you would give the last one with the lowest formal charge, however resonance is all possible structures.

Rachel Jiang 3H
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Re: Resonance

Postby Rachel Jiang 3H » Wed Nov 18, 2020 10:03 am

All resonance structures contribute to the overall structure of the molecule regardless of their formal charges. However, the resonance structure with the least amount of formal charges is the most stable structure, and should contribute the most to the overall structure. Hope this helps!


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