Chemistry - GOC Question with Solution | TestHub

All four are ${\mathrm{C}}_6{\mathrm{H}}_{12}$ isomers. The one with the highest ring strain has the most potential energy. Cyclopropane has the highest ring strain (27.5 kcal/mol), then cyclobutane (26.3), cyclopentane (6.2) and cyclohexane (0). So (IV) has the largest heat of combustion.