Chemistry - GOC Question with Solution | TestHub

All four are $C_7$$H_{14}$ isomers, so the least stable alkene gives out the most heat. Hept-1-ene has a monosubstituted double bond, which is the least stable of the four (the others carry two, three and two alkyl groups on the double bond). So hept-1-ene has the maximum heat of combustion.