The molecules that have polar bonds are CH₃Cl, and H₂O.
A polar bond is a type of covalent bond where the electron is unequally distributed.
This unequal distribution is due to the electronegativity difference of the attached atoms in the molecule.
A lewis structure of the molecule is studied to determine whether the compounds are polar and non-polar.
The molecule CCl₄: has one carbon atom at the center and the chlorine surrounds the carbon from all four sides, so even if there is a difference in the electronegativity the net dipole movement gets balanced from all four sides, so it is not a polar bond.
The molecule CH₃Cl
Similar to the CCl₄, hydrogen, and chlorine is surrounding the carbon, the three sides are hydrogen and one side is chlorine, so there is a net dipole movement and so it is a polar bond.
The molecule H₂O: The dipole movement of Hydrogen and oxygen are both in opposite directions and of different magnitude hence it will have a net dipole movement and so it is polar.
The molecule CO₂ and O₂ have net dipole movements as zero so are not polar compounds.
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