See image — Hydrocarbons Chemistry Question

💡 Solution & Explanation

Correct option: \(\text{D}\). Structural and conformational isomers have the same molecular formula but differ in carbon skeleton, position of unsaturation, or spatial arrangement around single bonds. Recovered question text: 25. Which member of each of the following pairs would you expect to have the larger heat of combustion (1) cis- or trans-1, 2-dimethylcyclohexane (2) cis- or trans-1, 3-dimethylcyclohexane (3) cis- or trans-1, 4-dimethylcyclohexane. (a) (1) cis-isomer > trans-isomer, (2) cis-isomer < trans-isomer, (3) cis-isomer > trans-isomer (b) (1) cis-isomer < trans-isomer, (2) cis-isomer < trans-isomer, (3) cis-isomer > trans-is