C2H4 is ethylene, also known as ethene, is not non polar. It is a non polar molecule but has polar bonds. This is because the electronegativity values of carbon and hydrogen are nearly equal. Therefore, the electrons in the C-H bond are shared almost equally between the two atoms, and there is no significant partial charge on either atom. This results in a non polar molecule. However, the molecule as a whole is polar due to the presence of the double bond between the two carbon atoms. The double bond creates a region of high electron density between the two carbon atoms, which gives the molecule a net negative charge. This negative charge is balanced by the two positive charges on the hydrogen atoms, resulting in a polar molecule.