Which of the following alkenes has the smallest molar heat of hydrogenation (ie, releases the least heat upon hydrogenation)?
A) 2,3-dimethyl-2-butene
B) 2-methyl-2-butene
C) trans-2-butene
D) cis-2-butene
E) 1-hexene

Question

Quizplus · Accepted Answer

2,3-dimethyl-2-butene is the most stable alkene due to its high degree of substitution and steric hindrance, resulting in the smallest molar heat of hydrogenation.

Which of the Following Alkenes Has the Smallest Molar Heat