Classification

Olefin is a general terms used for unsaturated hydrocarbons such as hydrocarbons which have more than one bond between their carbon atoms. It is derived from the latin word oleum (oil) and facere (make), since these products formed are usually oily in nature.

Also known as arenes, they are a special category of hydrocarbons that have a ring-like structure. These hydrocarbons consist of delocalized pie electrons and are known to be very stable. Benzene is known to be the simplest aromatic hydrocarbon 

Paraffin is a term derived from the latin literature meaning low reactivity or little affinity. This term is generally used to denote alkanes because out of all the hydrocarbons, they have the least reactivity because of having a strong carbon bond between their atoms.