Question

Difference in heat of hydrogenation of propene and cyclopropane

Answer 1

Answer:

The reaction of cyclopropane breaks a s bond while the reaction of propene a p bond. ... If we correct for this difference by thinking of it in terms off making the s bond "weaker" to make it more like the p bond, then the heat of hydrogenation of cyclopropane becomes -57.6 kcal/mol. (i.e. more exothermic by 20 kcal/mol).