Which statement best explains why the petrol fraction obtained from fractional distillation contains mainly molecules with a similar number of carbon atoms?

The correct option is Petrol is a mixture of many different hydrocarbons, but the distillation process separates them by their boiling points, which are related to the number of carbon atoms..

The correct option is Petrol is a mixture of many different hydrocarbons, but the distillation process separates them by their boiling points, which are related to the number of carbon atoms.. Petrol is a mixture of many different hydrocarbons, but the distillation process separates them by their boiling points, which are related to the number of carbon atoms. is correct because it directly supports the approved learning objective to explain that each fraction contains molecules with a similar number of carbon atoms. This belongs to Fractional distillation and petrochemicals within Carbon compounds as fuels and feedstock, so the answer must use the correct organic chemistry context. The other options are incorrect when they confuse the organic family, formula type, reaction condition, product, or property being tested. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.