Isomeric structures Isomeric(greak ioouapng):isos equal;meros part Compounds of identical molecular formula but different structures I constitutional isomers structural isomers like ethanol and dimethylether CH3-CH,-OH CHz-O-CH3 ll stereomeric isomers 1.Configurational isomers In stereoisomers the bond structure is the same,but the geometrical positioning of atoms and functional groups with respect to optically active C atoms differs. This class includes enantiomers where different isomers are non-superimposable mirror-images of each other,and diastereomers when they are not.This also in- cludes cis-trans isomers or geometric isomers,respectively.Isomeric structures Isomeric (greak ἰσομερής): isos = equal; meros = part Compounds of identical molecular formula but different structures I = constitutional isomers structural isomers like ethanol and dimethylether CH3 -CH2 -OH CH3 -O-CH3 II = stereomeric isomers 1. Configurational isomers In stereoisomers the bond structure is the same, but the geometrical positioning of atoms and functional groups with respect to optically active C atoms differs. This class includes enantiomers where different isomers are non-superimposable mirror-images of each other, and diastereomers when they are not. This also in￾cludes cis - trans isomers or geometric isomers, respectively