# Ethanol (C₂H₅OH) and 1-bromopropane (CH₃CH₂CH₂Br) are both organic compounds. Describe the key structural features that make each compound belong to its respective homologous series, and explain what type of chemical is produced when the bromine atom in 1-bromopropane is replaced by a hydroxyl group.

> WJEC A-Level Chemistry (Wales) — 3.3 Alcohols and halogenoalkanes · Describe · 5 marks

> Ethanol is widely used as a solvent and in alcoholic drinks. 1-Bromopropane is a halogenoalkane used in industrial synthesis.

## Mark scheme (5 marks)

1. Ethanol contains a hydroxyl (–OH) functional group
2. The presence of the hydroxyl group makes ethanol an alcohol
3. 1-Bromopropane contains a halogen atom (bromine) bonded to a carbon chain
4. The presence of the halogen (bromine) bonded to the carbon chain makes 1-bromopropane a halogenoalkane
5. Replacing the bromine atom with a hydroxyl (–OH) group produces an alcohol (propan-1-ol)

## Key terms

- [hydroxyl group](https://www.gradenine.co.uk/glossary/hydroxyl-group)
- [homologous series](https://www.gradenine.co.uk/glossary/homologous-series)

## Related

- [Revision notes for WJEC A-Level Chemistry (Wales)](https://www.gradenine.co.uk/learn)
- [How to answer "Describe" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
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Source: [GradeNine](https://www.gradenine.co.uk/q/ethanol-c-h-oh-and-1-bromopropane-ch-ch-ch-br-are-32d930a4) · Published by Druglandscape Ltd.