Which of the following best describes the relationship between the number of carbon atoms in an alkane and the fraction it will appear in after fractional distillation of crude oil?

The correct option is Alkanes with more carbon atoms will appear in fractions that boil at higher temperatures..

The correct option is Alkanes with more carbon atoms will appear in fractions that boil at higher temperatures.. Alkanes with more carbon atoms will appear in fractions that boil at higher temperatures. 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.