Cis and Trans Dichloroethene

(Polar molecules, Non-polar molecules, etc.)

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Joann Hernandez 2F
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Joined: Fri Sep 25, 2015 3:00 am

Cis and Trans Dichloroethene

Postby Joann Hernandez 2F » Wed Oct 21, 2015 2:23 pm

How do we determine the position in which the chlorine atoms are placed? How do we distinguish when they should be on opposite sides of the double bond or when they're on the same side of the double bond?

Chem_Mod
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Re: Cis and Trans Dichloroethene

Postby Chem_Mod » Wed Oct 21, 2015 2:46 pm

For this class, you will be showed/told if asked a question such as this. Once you learn the nomenclature (next semester), you can be expected to know the difference between isomers.

Ani Galfayan 1H
Posts: 27
Joined: Fri Sep 25, 2015 3:00 am

Re: Cis and Trans Dichloroethene

Postby Ani Galfayan 1H » Wed Oct 21, 2015 2:52 pm

The prefix "cis-" means that the chlorine atoms are on the same side of the double bond. This positioning also makes the molecule polar due to the asymmetry (the dipoles don't cancel).
"Trans-" means the chlorine atoms are located on the same side. This positioning make the dipoles cancel and therefore makes the molecule non polar.

RaquelLopez_1L
Posts: 12
Joined: Fri Sep 25, 2015 3:00 am

Re: Cis and Trans Dichloroethene

Postby RaquelLopez_1L » Fri Oct 23, 2015 10:39 am

For the chlorine, how in the cis they do not cancel but in the trans they cancel, does that just determine whether it is polar or nonpolar or does it also relate to the charges and repulsion?


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