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CH2CL2 has the molecular shape of a tetrahedral. Due to the nature of a tetrahedral, the Cl atoms will be right next to each other. You can imagine a tripod with another leg above it. No matter how you rotate this shape, Cl will be right next to another Cl. Since the dipole moments move towards both Cl, there will be no cancellation and it will be a polar molecule. Lewis structures can be deceiving so always think of molecular shape.
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