A polar molecule is a molecule that has an overall dipole moment. This depends on the structure of the molecule.
The molecules that will be polar include;
A bent molecule with one polar bond and one non polar bond
A linear molecule with one polar and one non polar bond
A bent molecule with two equivalent polar bonds
A bent molecule with two non polar bonds
The presence of polar bonds does not automatically mean that a molecule will be polar.
Polarity also has to do with the structure of the molecule. This means the actual arrangement of atoms in the molecule.
All bent molecules are polar due to asymmetrical electron distribution in bent molecules.
However, a linear molecule with two equivalent polar bonds will be non polar since the dipoles will cancel out. If the linear molecule has one polar and one non polar bond, the molecule will have an overall dipole moment and will therefore be polar.
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