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The bonds are polar because chlorine is highly electronegative. That produces minor negative charge on each chlorine in the compound and minor positive on the boron. Because chlorine is large and boron small, the overall effect is to produce a molecule that appears to carry a slight negative charge because the minor positive charge is "buried" inside the molecule. To be trully polar, a molecule must have both a minor negative and minor positive charge open to its surroundings (not a good way to explain, but I hope it makes sense).

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16y ago

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