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11.15.    If B–Cl bond has a dipole moment, explain why   BCl_{3}   molecule has zero dipole moment.

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Due to differences in electronegativities of Boron and chlorine, the partial charges develop in B-Cl bond. BCl_{3} is a non-polar compound. This molecule is trigonal planner shape (symmetrical) and we know that dipole moment is a vector quantity. In fig. we can see that, they can cancel out each other.
dipole moment

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