ORGANIC CHEMISTRY Chapter l Resonance structures, then, are not structures for the actual molecule or ion they exist only in theory. CH2-CH=O CH,-CH-O CH2=CH-CH2 CH2CH=CH2 ++CH2-CH-CH2 2 3 CH2--CH-CH CH2-CH-CH 2 2 5 Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 1 Resonance structures, then, are not structures for the actual molecule or ion; they exist only in theory. Resonance structures, then, are not structures for the actual molecule or ion; they exist only in theory. CH2 CH O CH2 CH O CH2 CH CH2 CH2 CH CH2 CH2 CH CH2 CH2 CH CH2 CH2 CH CH2 1 2 3 4 5