Hydrocarbons are usually nonpolar, since their bonds line up opposite each other to cancel out any dipole moment. But in small hydrocarbons that have an alcohol group (OH), which is a polar group, a...
There are many things that determine whether something is polar or nonpolar, such as the chemical structure of the molecule. In the case of water, it is polar.
The aromatic hydrocarbons are those compounds which are comprised of only the elements carbon and hydrogen arranged so that at least some of the carbons are linked together to form a ring.