Question

Which alkene will have the lowest heat of hydrogenation?

Answer 1

The most stable alkenes have the smallest heat of hydrogenation because they are already at a low energy level. When you hydrogenate an alkene, you get an alkane. The alkane is more stable than the alkene, so energy is released. This energy is called the heat of hydrogenation

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Answer 2

The most stable alkenes will have the lowest heat of hydrogenation.