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

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Jessica Luong 3E
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Postby Jessica Luong 3E » Sun Nov 24, 2019 11:18 pm

There are three isomers of dichlorobenzene, C6H4Cl2, which differ in the relative positions of the chlorine atoms on the benzene ring. (a) Which of the three forms are polar? (b) Which has the largest dipole moment?

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Re: 2E.29

Postby Maia_Jackson_2C » Mon Nov 25, 2019 1:40 pm

The first two isomers are polar because the C-Cl bond dipoles are not pointing in opposite directions and do not cancel out. The first form has the largest dipole moment because the bond angle between the two Cl's is the smallest.

Chris Tai 1B
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Re: 2E.29

Postby Chris Tai 1B » Wed Nov 27, 2019 7:06 pm

Because the third isomer in this drawing has the chlorines on opposite sides of the "benzene" ring, those chlorine bonds are indeed polar as they are connected to a single carbon, but the molecule as a whole is not polar because the dipole moments created by those two opposite chlorine cancel out.

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Re: 2E.29

Postby AGulati_4A » Wed Nov 27, 2019 7:15 pm

a) IF the chlorines are apart from each other the molecule is non-polar as the dipole moments cancel each other --in any other case it would be polar
b) The largest dipole moment would occur in the molecule which ahs the chlorines closest to each other.

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