Define dipole moment. The dipole moment of BF_3 is zero. Why?

1.	Define dipole moment. The dipole moment of BF_3 is zero. Why?
Answer» ANSWER :In `BCl_3` the three polar B-Cl bonds are directed towards the three CORNERS of an equilateral triangle. DIPOLE moment is a vector quantity. Sicne `BCl_2` is SYMMETRICAL, the individual moments get CANCELLED. Thus `BCl_3` has a net dipole moment zero.

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