Which hydrocarbon will be the last to collect in the beaker pentane hexane heptane octane?

Octane will be the last hydrocarbon to collect in the beaker among pentane, hexane, heptane, and octane. This is because octane has the highest molecular weight and longest carbon chain, resulting in a higher boiling point compared to the others. Therefore, it will evaporate and condense at a higher temperature, leading to later collection in the beaker.