Methanol CH3OH\mathrm{CH_{3}OH}CH3OH, ethanol C2H5OH\mathrm{C_{2}H_{5}OH}C2H5OH and propanol C3H7OH\mathrm{C_{3}H_{7}OH}C3H7OH are the first three members of a homologous series.
(relative atomic masses: C = 12, H = 1, O = 16)
Statement 1: The general formula of the series is CnH2n+1OH\mathrm{C_{n}H_{2n+1}OH}CnH2n+1OH.
Statement 2: The relative formula mass of the fourth member, butanol, is 74.
Statement 3: Their boiling points increase with chain length because more covalent bonds must be broken when they boil.
Which statements are correct?
1 only
1 and 3 only
1, 2 and 3
1 and 2 only
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.