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Chapter 15: Benzene and Aromaticity

11 Chapter 15: Benzene and AromaticityHHHHHHHHHHHHC6H62 -bonding MO -antibonding MOMO s of a C=C -bond * +235 KJ/mol-235 KJ/molfrom Chapter 123 -molecular orbitals of butadiene0 Nodes 3 bonding interactions 0 antibonding interactionsBONDING MO1 Nodes 2 bonding interactions 1 antibonding interactions BONDING MO2 Nodes 1 bonding interactions 2 antibonding interactions ANTIBONDING MO3 Nodes 0 bonding interactions 3 antibonding interactions ANTIBONDING MO 2 is the Highest Occupied Molecular Orbital (HOMO) 3 is the Lowest Unoccupied Molecular Orbital (LUMO)4 1 of Butadiene (no nodes, bonding MO)The four -electrons in 1 are delocalizedover the four p-orbitals _+ _+ H3 CCH3H2 CCH2H2 CCHCH3H2 CCHCHCH2H2 CCHCHCH2 Table (p.)

(chapter 2.5 and 2.6) 1. No one resonance forms accurately depicts the structure of the molecule. The real structure is a composite or hybrid of all resonance forms 2. Resonance forms differ only by the placement of π- or non-bonding electrons. Neither the position or hybridization of the atoms changes. 3. Resonance forms are not necessarily ...

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  Chapter, Chapter 2, Benzene, Chapter 15, Aromaticity, Benzene and aromaticity

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