Concept:Boiling point depends on the strength of intermolecular forces. Straight-chain hydrocarbons have more surface area and stronger London dispersion forces than branched isomers, so they boil at higher temperatures.Explanation:n-Pentane is a straight-chain molecule with a linear shape. Its molecules pack closely together, increasing van der Waals attraction and requiring more heat to separate. Its boiling point is 36°C.Branched isomers have compact shapes, reducing surface area and intermolecular forces. Isopentane boils at 28°C, neopentane at 10°C, and isobutane at -11.7°C.Thus, n-pentane has the highest boiling point among the given compounds.Answer:Option A – n-Pentane