Question

Which of the following compounds has the most negative heat of hydrogenation?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

Heat of hydrogenation $\alpha \frac{1}{stabilityofalkene}$
Stability of alkene $\alpha$ No. of $\alpha$ Hydrogens
So, the most unstable alkene out of the given compounds is (a).
Hence, the most negative heat of hydrogenation will be observed for alkene (a).