1. Define the homologous series. Define the olefin and give an example of it (4 pts). 2. Identify the types (such as paraffins, naphthenes, or aromatics) of the following Solution Ans 1 : Homologous series are the compounds that have the same functional group , due to which they have the similar chemical properties. It could be a series of alkanes , alkenes or even alcohols or aldehydes that have the same functional group such as -OH or -CHO at their parent hydrocarbon chain. Olefin are the compounds made up of carbon and hydrogen which have one or more than one carbon atoms forming double bonds , basically alkenes. examples of olefins are : ethylene , propylene etc .