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  4. Of these compounds, which compound has minimum heat of hydrogenation per π -bond?

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Q. Of these compounds, which compound has minimum heat of hydrogenation per $\pi $ -bond?

NTA AbhyasNTA Abhyas 2020Organic Chemistry – Some Basic Principles and Techniques

Solution:

Heat of hydrogenation $ \propto \frac{\text{1}}{\text{stability} \, \text{of} \, \text{compound}}$

Benzene is most stable because it is aromatic so it will have least heat of hydrogenation.