Question

Which one of the following compounds would have the highest heat of hydrogenation ?
A. `H_(2)C=CH_(2)`
B. `CH_(3)-CH_(2)-CH=CH_(2)`
C. `H_(3)C-CH=CH-CH_(3)`
D. `(CH_(3))_(2)C=C(CH_(3))_(2).`

Answer 1

Correct Answer - A
More the stability of an alkene, lesser is its heat of hydrogenation. The least stable alkene will have highest heat of hydrogenation. The least stable alkene, out of the four given options is ethene. (no hyperconjugation Possible).