This question is about fuels. Octane (C₈H₁₈) is a hydrocarbon in petrol. Cracking breaks down large hydrocarbon molecules into smaller hydrocarbon molecules.
Which hydrocarbon molecule can be cracked to produce octane, C₈H₁₈?

Cracking is a thermal decomposition process that breaks down long-chain hydrocarbons into shorter, more useful hydrocarbons. To produce octane (C₈H₁₈), the starting hydrocarbon must be larger. - C₄H₈ and C₄H₁₀ are smaller than C₈H₁₈. - C₈H₁₆ has the same number of carbon atoms. - C₁₂H₂₆ is a larger molecule (12 carbon atoms) and can be broken down to form C₈H₁₈ and other products, for example: C₁₂H₂₆ → C₈H₁₈ + C₄H₈.