Restricted rotation about C=C
What Restricted rotation about C=C means in Chemistry A-Level, as defined for OCR.
Definitions of Restricted rotation about C=C
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
Check what you remember
Read the wording for your board, then hide it and explain Restricted rotation about C=C in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Rotation about the double bond is restricted because the π bond locks the two carbon atoms in one plane, so groups cannot swap sides by rotation.
Rotation about the C=C group is restricted, which holds the two arrangements in place so they are separate stereoisomers.
Rotation about the C=C double bond is restricted, locking the groups into different spatial arrangements.
Topics that use Restricted rotation about C=C
- Alkenes (OCR A-Level)
Related terms
- Addition polymerisation
- Addition polymerisation of alkenes
- Addition reactions forming other organic chemicals
- Atomic number and first point of difference
- Biodegradable and renewable alternatives
- Biodegradable polymers
- bond breaking and bond formation
- Bromine water test for unsaturation
Using Restricted rotation about C=C 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.
A week of Premium from your first lesson · Then the free plan continues · No card, no charge