Chemistry A-Level
E-Z isomerism
What E-Z isomerism means in Chemistry A-Level, as defined for AQA.
Definition of E-Z isomerism
Check what you remember
Read the wording for your board, then hide it and explain E-Z isomerism in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Arises where rotation is restricted, most often about a C=C double bond, so two groups fixed on the same side differ from two fixed on opposite sides.
Topics that use E-Z isomerism
- Isomerism (AQA A-Level)
Related terms
- atomic number comparison
- CIP priority rules
- E and Z isomers
- first point of difference
- Optical isomerism
- restricted rotation
- stereoisomers
- structural isomer
Using E-Z isomerism in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Chemistry questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Chemistry A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge