Chemistry - GOC Question with Solution | TestHub

(III) has 9 carbons and the other three have 8, so (III) has the largest heat of combustion. Among the $C_8$ isomers, the heat of combustion is proportional to 1/stability. (I) has a trisubstituted double bond (the most stable), (IV) a disubstituted ring double bond, and (II) an exocyclic double bond (the least stable).

Order : III $>$ II $>$ IV $>$ I.