Delocalized Pi Bond/Resonance

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Karina Rodriguez 2H
Posts: 50
Joined: Wed Sep 30, 2020 9:34 pm

Delocalized Pi Bond/Resonance

Postby Karina Rodriguez 2H » Sun Nov 29, 2020 9:39 pm

Would a delocalized pi bond only exist in a substance with resonance structures?

dana hu 1B
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Joined: Wed Sep 30, 2020 9:37 pm
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Re: Delocalized Pi Bond/Resonance

Postby dana hu 1B » Sun Nov 29, 2020 9:44 pm

Yes, you're correct. Because when there are only single bonds (and, therefore, only sigma bonds), there can't be resonance since all bonds are the same. Thus, resonance can only exist when a molecule has at least one double bond (for example, ), and, as we learned, a double bond consists of 1 sigma and 1 pi bonds. Therefore, any molecule that has resonance has at least 1 pi bond.

Leyla Anwar 3B
Posts: 60
Joined: Wed Sep 30, 2020 10:03 pm

Re: Delocalized Pi Bond/Resonance

Postby Leyla Anwar 3B » Sun Nov 29, 2020 10:06 pm

This would be true with any bond that is more than just a single bond because a double bond and triple bond mean that a pi bond is present. You can't have a pi bond with single bonds (because those are sigma). Any structure with resonance, means there is at least one bond greater than a single bond because otherwise the structure would not have any variation.

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