How do alkanes differ from alkenes?
An alkane is proposed to be fully saturated, i.e. there are maximum number of
See this old answer for more details. When given an organic formula, assessment of the degree of unsaturation should be the first thing you do. How many rings, how many double bonds, are in the molecule?
With respect to ethane or propane, how many degrees of unsaturation does acetylene have; what about cyclopropene?