Sapling Q #16

[Jared Limqueco 3E]

Which of the species contains a delocalized pi bond? HCN, O3, H2O, [CO3]2-

How do I approach this? What does it mean to be delocalized?

[dana hu 1B]

A delocalized pi bond tells us there is resonance in the lewis structure of the molecule because a certain pi bond can exist in more than one configuration.
it should be o3 and co3-2

[Eva Becker]

Which of the species contains a delocalized pi bond? HCN, O3, H2O, [CO3]2-

How do I approach this? What does it mean to be delocalized?

Hi! First we need to identity which molecules have pi bonds which can be easily identified when we draw the molecular structures and look for any double and/or triple bonds. To be delocalized, the structure with pi bonds (double or triple bonds) must also have a resonance structure. Thus, the answer is whichever molecules with double and/or triple bonds that have resonance structures.

[Halle Villalobos 3E]

Hi! Delocalized pi bonds occur when pi orbitals extend over more than two atoms. In terms of Lewis structures, this occurs with resonance structures involving double and triple bonds. I hope this helps!

[Varsha Ravi 3E]

Species with delocalized electrons usually have resonance structures, since there's multiple equally likely structures, the electrons are "delocalized" and spread throughout the multiple structures. They also often have double or triple bonds (which have pi bonds, since double bonds have 1 pi bond + 1 sigma bond, and triple bonds have 2 pi bonds + 1 sigma bonds). Therefore, look for the species in the list that have resonance structures and double/triple bonds.

[Stephen Min 1I]

To approach this you would examine the Lewis structures for species that have resonance since the delocalized electrons are spread throughout the species.

[Isabella Cortes 2H]

to approach this problem you would look for the molecules that has resonance structures since it indicates that electrons are spread throughout the molecule, thus the electrons are delocalized.

[Astha Patel 2J]

Molecules with resonance structures where the double or triple bond can be moved among different atoms consist of pi bonds, so depending on the lewis structures and whether resonance is possible, that can show whether the bonds are delocalized.

[Kat Stahl 2K]

I found a video that I thought was really helpful in this concept. Here it is!
https://www.youtube.com/watch?v=n2Z2tASz7Uk
Hope this helps you!

[Rachel Kho Disc 2G]

You would need to first discern which molecules have double or triple bonds (which have one pi bond and two pi bonds, respectively). Of these molecules, you would then determine whether or not there are resonance structures in which the double or triple bonds can be moved around. If that is the case, then this molecule has a delocalized pi bond.

[Britney Tran IJ]

I found a video that I thought was really helpful in this concept. Here it is!
https://www.youtube.com/watch?v=n2Z2tASz7Uk
Hope this helps you!

thank you so much for this resource! it definitely helped a lot

[Karen Elrayes 1L]

After drawing the lewis structures, see which ones have resonance and those will be the ones that are delocalized.

[Callan Howard]

Hi, I believe it means that the pi bond can move around to the other bonds because of resonance, so it is not permanently in the one location, therefore delocalized.

[Joshua Chung 2D]

Delocalized simply means that there exist resonance structures for the compound, so the pi bond(s) can exist in multiple different positions.

[George_Yin_3I]

Delocalized pi bonds occur when pi bonds extend to more than 2 atoms, so you can see after drawing out the Lewis structure.