Q. Which one of the following has the smallest heat of hydrogenation per mole?
A) 1-butene
B) $Trans$-but-2-ene
C) $Cis$-but-2-ene
D) Buta-1, 3-diene
Explanation
(d)
Heat of hydrogenation $\propto \frac{1}{stability}$
Among the given buta-1,3-diene is resonance stabilized, $ie$, more stable, thus it has lowest heat of hydrogenation
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.