Why bitumen has higher boiling point than petrol?

Bitumen has a higher boiling point than petrol due to its complex mixture of larger hydrocarbon molecules with significantly higher molecular weights. These larger molecules have stronger van der Waals forces and require more energy to break apart during the boiling process. In contrast, petrol primarily consists of smaller hydrocarbons, which have lower molecular weights and weaker intermolecular forces, resulting in lower boiling points. Thus, the structural differences lead to the varying boiling points of bitumen and petrol.