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Between figures 1 and 2 I understand they are polar because the Cl creates dipole moments. Between the two figures, how do you determine which one has the larger dipole moments?
The strength of the dipole is based on the angles of the polar bonds. Since polar bonds in opposite directions cancel out, the bonds that cancel the least will be the strongest. The polar Cl bonds for isomer 1 are closer to going in the same direction than the bonds for isomer 2, therefore the bonds in 1 cancel out less than in 2, so 1 will have a stronger dipole moment.
Think of it in terms of polarity; if a charge is concentrated on one side of the molecule and not the other, then the molecule will be polar, but if the charges are evenly distributed then the molecule's polarity will cancel out.
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