Crude oil is a finite resource that is separated into useful fractions. Which of these mixtures contains only formulas of substances that would typically be found in the refinery gas (gaseous) fraction of crude oil?
CH4\text{CH}_4CH4, C3H8\text{C}_3\text{H}_8C3H8, C4H10\text{C}_4\text{H}_{10}C4H10
CH3OH\text{CH}_3\text{OH}CH3OH, C2H6\text{C}_2\text{H}_6C2H6, C3H8\text{C}_3\text{H}_8C3H8
C2H4\text{C}_2\text{H}_4C2H4, C3H6\text{C}_3\text{H}_6C3H6, C4H8\text{C}_4\text{H}_8C4H8
CH3Cl\text{CH}_3\text{Cl}CH3Cl, C2H6\text{C}_2\text{H}_6C2H6, C4H10\text{C}_4\text{H}_{10}C4H10
130 exam-style questions on Edexcel GCSE Chemistry 9.1 Fuels, covering 9.1.1 Hydrocarbons and crude oil, 9.1.2 Fractional distillation of crude oil and its fractions, 9.1.3 The alkanes as a homologous series, 9.1.4 Complete and incomplete combustion, 9.1.5 Pollutants from burning fuels, 9.1.6 Hydrogen as a fuel and non-renewable fossil fuels, and 9.1.7 Cracking of larger alkanes. Each one has a worked solution and a mark scheme showing where the marks go.