(Polar molecules, Non-polar molecules, etc.)
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Part b) of question 2E. 29), is asking us to identify which of the three isomers of dichlorobenzene has the largest dipole moment. Can someone explain to me why the first structure has the largest dipole moment in comparison to the second isomer?
Because the two chlorines are closer together on the first molecule, they create a strong negative pull. In the second molecule, they are a bit farther apart, and because of this the negative pull created by the individual chlorines partially cancel each other, creating a weaker overall pull.
In the second example, the dipole moments are pointed away from each other so some of that pull will be cancelled if the vectors are added together. However, if the two dipole vectors are added in the first example, they are pointed in almost the same direction so the magnitude will be larger.
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