(Polar molecules, Non-polar molecules, etc.)
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In 6th edition question 4.25, the answer key suggest that CH2Cl2 is polar. But if we draw the lewis structure in which the two Cl atoms are opposite to each other, wouldn't the charge cancel out and make the molecule nonpolar? How do we know which way to draw?
This Lewis structure does not reflect the 3D structure of CH2Cl2, which is tetrahedral. With this arrangement, no matter what, at least two corners of the tetrahedron has chlorine atoms. This, along with the difference in electronegativity of chlorine and carbon, produces a net nonzero dipole moment and thus a polar molecule.
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