Problem: Which has the smallest heat of hydrogenation?

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We are asked which has the smallest heat of hydrogenation?

Heat of hydrogenation of an alkene is the standard enthalpy of catalytic hydrogenation of an alkene.

  • ↑ alkene stability, ↓ heat of hydrogenation.
  • The most stable alkene has the most amount of substituents (excluding H).

Analyze each: 

Molecule A

  • 4 Subtituents

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Problem Details

Which has the smallest heat of hydrogenation?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Alkene Stability concept. You can view video lessons to learn Alkene Stability. Or if you need more Alkene Stability practice, you can also practice Alkene Stability practice problems.

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Based on our data, we think this problem is relevant for Professor Thomas' class at UCF.