Optical isomerism is not on the core part of the programme but is in the AHL under topic 20.3 Stereoisomerism. It also appears in the extension material of Option B under AHL topic B.10 Stereochemistry in biomolecules and in Option D under the AHL topic D.7 Taxol - a chiral auxiliary case study. When covering topic 20 with Higher Level students, teachers need to teach students how to use wedge-dash type representations...