ORGANIC CHEMISTRY Chapter l Resonance Theory(共振论) e This theory states that whenever a molecule or ion can be represented by two or more Lewis structures that differ only in the positions of the electrons o two things will be true None of these structures which we call resonance structure or resonance contributors will be a correct representation for the molecules or ion. None will be in complete accord with the physical or chemical properties of the te substance g The actual molecule or ion will be better represented by a hybrid of these structures Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 1 Resonance Theory（共振论） This theory states that whenever a molecule or ion can be represented by two or more Lewis structures that differ only in the positions of the electrons. Two things will be true None of these structures ,which we call resonance structure or resonance contributors, will be a correct representation for the molecules or ion. None will be in complete accord with the physical or chemical properties of the substance. The actual molecule or ion will be better represented by a hybrid of these structures