Which one between 2 - methylbut - 2 - ene and 2 - methylbut - 1 - ene has higher heat of hydrogenation and why?

Explanation

2 - Methylbut - 2 - ene contains nine hyperconjugable `alpha` - H atoms, so this molecule is involed in effective hyperconjugation. As a result this molecule gains extra stability and it has relatively lower heat of hydrogenation. On the other hand, 2 - methylbut - 1 - ene contains only five hyperconjugable `alpha` H - atoms and so effect o hyperconjugable stabilising this molecule is relatively less. Thus it has relatively higher heat of hydrogenation.
`overset(alpha)(C)H_(3)-underset(""^alphaCH_(3))underset(|)(C)=overset(alpha)(C)H_(2)CH_(3) " " CH_(2)=underset(""^alphaCH_(3))underset(|)(""^alphaCH_(2))CH_(3)`