Bond lengths

Moderators: Chem_Mod, Chem_Admin

Alfred Barrion 2H
Posts: 100
Joined: Sat Jul 20, 2019 12:16 am

Bond lengths

Postby Alfred Barrion 2H » Sun Nov 03, 2019 11:18 pm

Why is it when there is a resonance structure, all of the bond lengths are the same even though there's double and single bonds.

Maya Serota 3G
Posts: 53
Joined: Tue Sep 24, 2019 12:17 am

Re: Bond lengths

Postby Maya Serota 3G » Sun Nov 03, 2019 11:41 pm

The structure represents it that way because it is the best we can do, but in reality there aren’t actually double and single bonds like that.

Aadil Rehan 1D
Posts: 52
Joined: Thu Jul 11, 2019 12:16 am
Been upvoted: 1 time

Re: Bond lengths

Postby Aadil Rehan 1D » Sun Nov 03, 2019 11:50 pm

Resonant compounds have more delocalized electrons, so they're kind of swooshing around the bonds all the time. The bond length we have is an average of what is measured.

EricZhao3G
Posts: 51
Joined: Tue Oct 08, 2019 12:16 am

Re: Bond lengths

Postby EricZhao3G » Mon Nov 04, 2019 1:45 pm

In reality, the molecule is a resonance hybrid and is a combination of all of the resonance structures. This results in a bond length between a single and double bond since the bonds are defined as neither a single bond nor a double bond.

Lauren Tanaka 1A
Posts: 109
Joined: Sat Aug 17, 2019 12:18 am

Re: Bond lengths

Postby Lauren Tanaka 1A » Tue Nov 05, 2019 2:54 pm

All the bond lengths are the same because in resonance structures the bond lengths are an average of every single bond leading them to all be the same length.

Joanne Lee 1J
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: Bond lengths

Postby Joanne Lee 1J » Wed Nov 06, 2019 11:47 pm

The bond lengths are the same value because the actual structure is a mixture of all the different versions of the resonance structure. Therefore, it isn't just one that has a double bond and the rest a single bond but all the bonds are a mixture of both, making the bond length in between the value of a double and single bond.

Jainam Shah 4I
Posts: 130
Joined: Fri Aug 30, 2019 12:16 am

Re: Bond lengths

Postby Jainam Shah 4I » Thu Nov 07, 2019 12:05 am

The electrons that are shared are delocalized meaning a specific single or double bond doesn't have full control of them. They are delocalized and the effect is spread among the entire structure. So a single bond has some double bond character while a double bond has single bond character. This is why all bonds are an intermediate length between the length of the single and double bond.

emma brinton_3B
Posts: 53
Joined: Fri Aug 09, 2019 12:17 am

Re: Bond lengths

Postby emma brinton_3B » Thu Nov 07, 2019 9:21 am

this is because the actual structure of the molecule is a hybrid of the resonance structures, meaning the bond lengths would be an average of each other.

Giselle Littleton 1F
Posts: 78
Joined: Wed Sep 18, 2019 12:20 am

Re: Bond lengths

Postby Giselle Littleton 1F » Fri Nov 08, 2019 2:59 pm

The bond lengths are all the same in the resonance structure because the structures all approximate the actual structure that is supposed to form. That is, the resonance structures are a mix of structures close to the actual structure.

Astrid Lunde 1I
Posts: 103
Joined: Sat Sep 07, 2019 12:16 am

Re: Bond lengths

Postby Astrid Lunde 1I » Fri Nov 08, 2019 3:37 pm

The bond lengths are all the same because the actual structure is a mix of all the resonance structures.

Kishan Shah 2G
Posts: 132
Joined: Thu Jul 11, 2019 12:15 am

Re: Bond lengths

Postby Kishan Shah 2G » Fri Nov 08, 2019 4:27 pm

This is due to the fact that the electrons are delocalized. Therefore, the bonds in the structure are a blend of single and double bonds, or in another words they have single and double bond character. Therefore the bond lengths are the same.

Kishan Shah 2G
Posts: 132
Joined: Thu Jul 11, 2019 12:15 am

Re: Bond lengths

Postby Kishan Shah 2G » Fri Nov 08, 2019 4:27 pm

This is due to the fact that the electrons are delocalized. Therefore, the bonds in the structure are a blend of single and double bonds, or in another words they have single and double bond character. Therefore the bond lengths are the same.


Return to “Resonance Structures”

Who is online

Users browsing this forum: No registered users and 1 guest