BRAINCAKEStereoisomerism
Stereoisomers have the same structural formula but a different arrangement of atoms in space.
E-Z isomerism is a type of stereoisomerism found in some alkenes. It happens because there is restricted rotation about the C=C double bond, as the pi bond would have to break.
For E-Z isomers to exist, each carbon of the C=C must have two different groups attached. But-2-ene has E-Z isomers, but but-1-ene does not because one of its double-bond carbons has two hydrogen atoms.
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All 17 lessons in Organic Chemistry · All AQA AS-level Chemistry topics