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Unformatted text preview: More resonance structures more stable the molecule Resonance structures show delocalization of electrons Most stable resonance structure most important Resonance importance 1. identical structures are equally important 2. structures that have complete octets are most important 3. structures with postive charge on less electronegative and negative on more electronegative are more important 4. if orbital overlap symbolized by a resonance structre is impossible cant happen COT vs. BENZENE Benzene has resonance because carbon 2p orbital’s can overlap COT does not because there is no overlap between 2p orbital’s Empirical resonance energy energy difference of 141 kJ 1/mol of benzene Criteria for Aromaticity 1. contain one or more rings that have cyclic arrangments of p orbital’s 2. every atom of aromatic ring has a p orbital 3. rings are planer 4. must contain 4n+2 pie electrons...
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This note was uploaded on 04/26/2011 for the course CHEM 221 taught by Professor Sffe during the Spring '11 term at Dickinson.
- Spring '11