# A student is given three organic compounds with the following molecular formulae: C₃H₈, C₄H₉OH, and C₂H₄. State the name of each compound and identify the homologous series to which each belongs.

> Cambridge International IGCSE Chemistry (0620) — 11.2 Naming organic compounds · State · 4 marks

## Mark scheme (4 marks)

1. C₃H₈ is named propane
2. C₃H₈ belongs to the alkanes
3. C₄H₉OH is named butan-1-ol (accept butanol)
4. C₂H₄ is named ethene AND belongs to the alkenes

## Key terms

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

## Related

- [Revision notes for Cambridge International IGCSE Chemistry (0620)](https://www.gradenine.co.uk/learn)
- [How to answer "State" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/a-student-is-given-three-organic-9df0e6b9) · Published by Druglandscape Ltd.