Substitution Vs Elimination of Halogenoalkanes
AQA A-Level Chemistry
3.3.3
Having explored nucleophilic substitution and elimination reactions separately, we can now bring these ideas together to understand how the two reaction pathways interact. We can then move on to consider the use of CFCs and the environmental impact of these compounds.
In this topic you will:
- Understand why nucleophilic substitution and elimination reactions occur concurrently.
- Be able to identify the conditions that favour substitution or elimination reactions.
- Understand the different roles of the hydroxide ion as both a nucleophile and as a base.
- Understand how reaction conditions affect the products formed.
Learn, Revise, Practise
Whether you’re learning this topic for the first time or revising before an exam, the Learn, Revise, Practise Method helps you study in the right way at the right time.
If you’re studying this topic for the first time, or you’re struggling to understand it, start with Learn. Once you’ve built that understanding, move on to Revise to strengthen your memory, before finishing with Practise to apply your knowledge to exam-style questions.
Learn
Build understanding
Watch the lesson and complete the Learn Pack as you go to develop a secure understanding of the topic.
Revise
Strengthen memory
Use active recall to check what you can remember, identify gaps and reinforce your understanding.
Practise
Apply knowledge
Work through exam-style questions and develop the confidence and technique needed for success.
Learn
Build Understanding
Start by building a secure understanding of the topic’s content. Download the Learn Pack and complete the guided activities alongside the video. This will help build your understanding and give you a comprehensive set of notes to refer back to. Once you’ve finished the video, use the questions in the pack to check your understanding. Finally, use the answers to review your work and correct any misunderstandings before moving on to the Revise phase.