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For questions about the dipole moment of a bond or a molecule; its calculation, comparison with other bonds or molecules, affect on molecular properties, etc.
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Why does dipole must lie parallel to a rotation symmetry axis?
If a molecule has a $C_n$ axis with $n > 1,$ it cannot have a dipole moment perpendicular to the axis of rotation (for example, a $C_2$ rotation would interchange the ends of such a dipole moment and reverse … Any dipole must lie parallel to a $C_n$ axis.
why does the dipole need to be parallel to the $C_n$ axis? …