279CHAPTER 12REACTIONS OF ARENES:ELECTROPHILIC AROMATIC SUBSTITUTIONSOLUTIONS TO TEXT PROBLEMS12.1The three most stable resonance structures for cyclohexadienyl cation areThe positive charge is shared equally by the three carbons indicated. Thus the two carbons ortho tothe sp3-hybridized carbon and the one para to it each bear one third of a positive charge (10.33).None of the other carbons is charged. The resonance picture and the simple MO treatment agreewith respect to the distribution of charge in cyclohexadienyl cation.
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