Pentanol is manufactured by reacting pentene, C5H10\text{C}_5\text{H}_{10}C5H10, with steam. The only organic compounds that may be present are pentene and pentanol. Pentanol does not react with bromine water.
A technician tests samples taken before and after purification.
| Sample tested | Observation when orange bromine water is added |
|---|---|
| Reaction mixture before purification | The bromine water turns colourless |
| Pentanol after purification | The bromine water stays orange |
Explain what the observations show about the organic compounds in the two samples.
Give the molecular formula of the organic product formed when pentene reacts with bromine, Br2\text{Br}_2Br2.
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.