• # question_answer 23) If B-Cl bond has a dipole moment, explain why$BC{{l}_{3}}$ molecule has a zero dipole moment?

Due to electro negativity difference between B and Cl, the bond B-Cl is polar and has a dipole moment. The overall dipole moment of a molecule depends upon its geometry. As $BC{{l}_{3}}$ has a triangular planar geometry, the overall dipole moment of the molecule is zero.