Consider the following alkenes: (I) , (II) , (III) . What is the correct decreasing order of their h — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

The heat of hydrogenation is inversely proportional to the thermodynamic stability of the alkene. Alkene stability increases with the number of $\alpha$ -hydrogens due to hyperconjugation. (I) has 12 $\alpha$ -H, (II) has 6 $\alpha$ -H, and (III) has 0 $\alpha$ -H. Stability order is I > II > III, making the heat of hydrogenation order III > II > I.