A chemist records the molecular formulae of two hydrocarbons: sample X is C6H14\text{C}_6\text{H}_{14}C6H14 and sample Y is C6H12\text{C}_6\text{H}_{12}C6H12.
Which sample is an alkene? Explain your answer.
97 exam-style questions on AQA GCSE Chemistry 7.2 Reactions of alkenes and alcohols, covering 7.2.1 Structure and formulae of alkenes, 7.2.2 Reactions of alkenes, 7.2.3 Alcohols, 7.2.4a Carboxylic acids, and 7.2.4b Carboxylic acids as weak acids. Each one has a worked solution and a mark scheme showing where the marks go.