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  4. The highest heat of hydrogenation is shown by which of the following compound?

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Q. The highest heat of hydrogenation is shown by which of the following compound?

NTA AbhyasNTA Abhyas 2020

Solution:

$\Delta H$ hydrogenation $ \propto \frac{1}{stability of alkenes}$ stability of alkenes. In option $\left(\right.1\left.\right),$ the $\pi $ electrons are not in conjugation so alkene is least stable and heat of hydrogenation is maximum.