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The stability of an alkene is directly proportional to its enthalpy of hydrogenation. Which of the following orders correctly represents this relationship?

1. The order is III > II > I.
2. The reaction is 2C6H6(g) + 9O2(g) → v2O5 410°C → Maleic anhydride.
3. The product is CH–C=O + 4CO2(g) + 4H2O(g).
4. None of these options are correct.

Correct answer: The order is III > II > I.

Solution

The enthalpy of hydrogenation is inversely proportional to the stability of the alkene. Hence, the given order III > II > I correctly reflects the stability trend.

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