The molecule which has dipole moment is

The molecule which has dipole moments is :

The molecule which has zero dipole moment is

The molecule which has zero dipole moment is

The molecule which has zero dipole moment is :

The molecule which has zero dipole moment is

Pick out of molecule which has zero dipole moment?

Explain the term dipole moment. Name two molecules which have dipole moment and two molecules which do not have dipole moment. What is the significance of dipole moment?