cis and trans
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cis and trans
Can someone explain what professor Lavelle was talking about in lecture with the whole cis and trans molecules.
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Re: cis and trans
In lecture, the polar molecule we were using as an example was cis-dichloroethene. The cis just means that the two chlorine atoms were on the same side giving the molecule its polarity. On the other hand, there was also trans-dichloroethene where the chlorine atoms were on opposite sides and so the polar bonds with dipole moments cancelled each other out making it non polar.
Re: cis and trans
cis molecule has same types of atoms on the same side.
trans molecule has same types of atoms on the opposite sides.
So, even the polar bonds exists, but the trans molecule is non-polar in general since they oppositely arranged atoms' dipole moments cancel out.
trans molecule has same types of atoms on the opposite sides.
So, even the polar bonds exists, but the trans molecule is non-polar in general since they oppositely arranged atoms' dipole moments cancel out.
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Re: cis and trans
Also remember that the van der Waals dispersion forces between the molecules will be identical in both cases
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Re: cis and trans
The main difference between the two is that the cis isomer is a polar molecule whereas the trans isomer is non-polar. Both of the isomers have exactly the same atoms joined up in exactly the same order. That means that the van der Waals dispersion forces between the molecules will be identical in both cases.
Re: cis and trans
cis molecules have side groups of atoms on the same side of a molecule whereas trans molecules have groups on opposite sides of the molecule
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Re: cis and trans
In a cis- molecule the dipoles will not cancel, while in a trans- molecule the dipoles will cancel.
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