Which of the following pairs of compounds correctly represent chain isomers? — Hydrocarbons Chemistry Question

💡 Solution & Explanation

Chain isomers differ in the arrangement of the carbon skeleton (straight vs. branched). But-1-yne and But-2-yne only differ in the position of the triple bond, so they are position isomers, not chain isomers. The other pairs have the same molecular formulas but different parent chain lengths due to branching, fulfilling the criteria for chain isomerism.