Which sequence ranks the following compounds in order of increasing heat of hydrogenation, ΔH_hyd?
1 cis-2-butene 2 1-butene 3 cyclohexene

Question

Which sequence ranks the following compounds in order of increasing heat of hydrogenation, ΔH_hyd? 1 cis-2-butene 2 1-butene 3 cyclohexene A) 3<1<2 B) 3<2<1 C) 2<1<3 D) 1<3<2

Quizplus · Accepted Answer

The heat of hydrogenation is inversely related to the stability of the alkene. Cyclohexene is the most stable, followed by cis-2-butene, and then 1-butene, which is the least stable. Therefore, the order of increasing heat of hydrogenation is cyclohexene < cis-2-butene < 1-butene.

Which Sequence Ranks the Following Compounds in Order of Increasing