Homologous Series
AQA A-Level Chemistry
3.3.1
Homologous series are families of organic compounds that contain the same functional group and therefore share similar chemical properties. By classifying compounds into homologous series, chemists can identify patterns in structure and reactivity without having to study every organic molecule individually. This topic introduces the major homologous series encountered in A-Level Chemistry and explores their functional groups, general formulae and naming conventions, providing an essential foundation for nomenclature, reaction mechanisms, structural isomerism and stereoisomerism.
In this topic you will:
- Explain how functional groups are used to classify organic compounds.
- Describe the key characteristics of homologous series.
- Identify functional groups within displayed, structural and skeletal formulae.
- Classify compounds into the correct homologous series.
- Recognise homologous series from their general formulae, prefixes and suffixes.
Begin with the Learn section if this is your first time covering the topic. If you are revising, move to Revise. If you are testing yourself, go straight to Practise.
Learn
Gain a complete understanding
Learn the core concepts and build a solid understanding.
What to do:
- Watch the video from start to finish.
- Focus on understanding key concepts.
- Complete the Learn Pack alongside the video.
Revise
Check understanding and build recall
Reinforce your knowledge by testing your recall regularly.
What to do:
- Use the flashcards (Leitner system).
- Do brain dumps to test your recall.
- Watch the video (coming soon) to check and fix gaps.
Practise
Apply knowledge in exam questions
Practise exam style questions and develop exam technique
What to do:
- Attempt the questions first (no notes!).
- Watch the video walkthrough (coming soon).
- Check your answers and learn from any mistakes.
Where does this fit?
This lesson is part of the Introduction to Organic Chemistry topic in Organic Chemistry.