Question

why alkene and alkyne are called olefins

Answer 1

 

It was derived from the original French "gaz oléfiant" which means "oil forming gas". Olefin was the original term, "alkene" was coined later to give a more systematic naming system (-ane, -ene and -yne, relating to aliphatic hydrocarbons with single bonds only, one or more double bonds, or one or more triple bonds, respectively).

In industry, however, (as opposed to schools and colleges) the term "olefin" is still the more commonly used term - e.g. the chemical company Ineos Olefins and Polymers.

Hope this may help u and be the brainliest ..

Answer 2

they have more than one bonds