Chemistry A-Level
cis-trans isomerism
What cis-trans isomerism means in Chemistry A-Level, as defined for AQA.
Definition of cis-trans isomerism
Check what you remember
Read the wording for your board, then hide it and explain cis-trans isomerism in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
A type of isomerism shown by square planar complexes in which two of the four ligands differ, giving a cis form with them 90° apart and a trans form with them 180° apart.
Topics that use cis-trans isomerism
- Shapes of complex ions (A-level only) (AQA A-Level)
Related terms
- 90° and 180° arrangements
- inactive trans isomer
- ligand size
- ligand substitution with DNA
- risks and benefits
- stereoisomerism
- bond angle of 109.5°
- cisplatin structure
Using cis-trans 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