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CClF3 is polar because it is asymmetrical. Imagine the central carbon atom inside a tetrahedrom with the base of 3 flourines and the top of a chlorine. Since the flourines are more electronegative than the chlorine (F is higher in the VIIA column than Cl), they will get the bigger share of the electrons, and Cl less. So the fluorine side is d- and the chlorine side d+. It is hard to draw on this, but this is my best:

Cl d+

C

F F F d-

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13y ago

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