most exothermic???

d ,

d is te most stable alkene , hence more Potential energy than others , hence gives out more energy than others on hydrogenation

sorry qwerty i dint get u..... 'most stable and highest potential energy'??

aise kaise???

Won't the most stable alkene require more energy to get hydrogenated? Meaning it would be an endothermic reaction...
The most exothermic one would be for the most unstable alkene. It would be desperate for hydrogenation..

are euclid sorry, i mean d is the most UNSTABLE alkene , i made a typo there. rest all is same .