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Stability of alkenes and aromatic compounds
Concepts tested here
- Heat of hydrogenation vs stability
All Questions
2015 AIPMT-I 1 question
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Given
The enthalpy of hydrogenation of these compounds will be in the order as:Enthalpy of hydrogenation $\propto \frac{1}{\text{stability}}$ (each compound takes up the same number of $H_2$).
I (mesitylene) is aromatic and most stable; II has two conjugated ring double bonds; III has three isolated exocyclic double bonds and is least stable.
So the enthalpy of hydrogenation is III > II > I.