Cis- vs Trans- bonds

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Ryan Juncker 3D
Posts: 51
Joined: Wed Sep 18, 2019 12:18 am

Cis- vs Trans- bonds

Postby Ryan Juncker 3D » Mon Nov 18, 2019 11:24 pm

Do we need to know the difference between Cis- and Trans- bonds for test 2 this week? And if so can someone please elaborate on it.

Sophia Shaka 3L
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Re: Cis- vs Trans- bonds

Postby Sophia Shaka 3L » Tue Nov 19, 2019 12:04 am

Dr. Lavelle did mention the concept before the content cutoff for Test 2, so I think we should know it. From what I understand of the example given in class, the cis molecule has a less symmetric Lewis structure you could say, with the same atoms or functional groups on the same side of the molecule. In class this caused the molecule to have dipoles that do not cancel, making it a polar molecule, whereas the trans structure was more symmetric, with dipole moments that cancelled, making the molecule nonpolar.

Justin Quan 4I
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Joined: Sat Sep 14, 2019 12:17 am

Re: Cis- vs Trans- bonds

Postby Justin Quan 4I » Fri Nov 22, 2019 12:39 pm

To add on, a Cis- molecule is a polar molecule that has polar bonds with dipoles that do not cancel, while a Trans- molecule must have zero electric dipole moment which is possible if it contains non -polar bonds, or polar bonds with dipoles that cancel.

chrisleung-2J
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Re: Cis- vs Trans- bonds

Postby chrisleung-2J » Fri Nov 22, 2019 3:45 pm

In addition, the Cis- and Trans- forms of molecules are able to exist when there is a double bond present between two atoms, separating each side of the molecule, due to each form having a distinct structure since the molecule cannot rotate about the central bond (usually a C=C bond).

Minh Ngo 4G
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Joined: Thu Jul 25, 2019 12:17 am

Re: Cis- vs Trans- bonds

Postby Minh Ngo 4G » Fri Nov 22, 2019 4:28 pm

It’s fair game since he did talk about it in class. Cis means the dipole moment cant cancel each other out while trans they do

Dan M -3E
Posts: 101
Joined: Wed Sep 18, 2019 12:19 am

Re: Cis- vs Trans- bonds

Postby Dan M -3E » Sun Nov 24, 2019 8:12 pm

It wasn't on that test but I'd guess we might have to know it for the final.


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