The Reason for Handedness in Molecules: Chirality Achiral -A molecule that has a plane of Symmetry plane symmetry in any of its possible conformations must be identical to its mirror image CH3 Propanoic acid,CH3CH2CO2H HC一H Has a plane of symmetry CO2H and so must be achiral CH3CH2CO2H Propanoic acid (achiral) Cengage Leaming.All Fighis ReoervedAchiral ▪ A molecule that has a plane of symmetry in any of its possible conformations must be identical to its mirror image ▪ Propanoic acid, CH3CH2CO2H ▪ Has a plane of symmetry and so must be achiral The Reason for Handedness in Molecules: Chirality