Isomers Have the same molecular formula but different structures Constitutional Isomers Stereoisomers Differ in the order of Atoms are connected attachment of atoms in the same order, but (connectivity); Section 1-9 differ in spatial orientation CHs CHCHCH, CH3 CH CH CHa Enantiomers Diastereomers Imagc and mirror Not related as image Imase are not super- and mirror image. imposable: Section 5-1 Section.5 CHE CH B F Br