Which statement best describes the relationship between the size of a hydrocarbon molecule and its flammability?

The correct option is Smaller molecules are more flammable because they have higher surface area to volume ratios..

The correct option is Smaller molecules are more flammable because they have higher surface area to volume ratios.. Smaller molecules are more flammable because they have higher surface area to volume ratios. is correct because it directly supports the approved learning objective to explain that some cracked products are useful as fuels because there is a high demand for fuels with small molecules. This belongs to Cracking and alkenes 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.