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1 has the largest dipole moment because since the chlorines are positioned close to one side of the molecule, that side of the molecule will have a polarized charge in comparison to the other side with no chlorines. 3 has the smallest dipole moment because since the molecule is symmetrical, any charge the molecule might have would cancel each other out.
It is precisely because the two chlorines are positioned close together that they have the largest dipole moment, because then there is a stronger force of repulsion due to their close proximity. Figure 3 would have essentially no dipole moment, as the symmetry has the dipole moments "cancel each other out" so that the figure would be linear, is how I would interpret it.
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