CBSE Class 11-science Answered
Account for the greater reactivity and the o, p-orientation in electrophilic substitution of biphenyl despite the electron-attracting inductive effect of the phenyl group.
Asked by Topperlearning User | 25 Jul, 2014, 07:18: AM
Expert Answer
In attack at the o-,p- positions the unreacted ring can stabilize the + charge on the attached C of the σ complex by electron-releasing delocalization that results in delocalizing the + charge to both rings. Such delocalization is impossible with the intermediate from meta substitution which does not have the + charge on the C bonded to the Ph substituent. The + charge cannot be incorporated into the second ring, and delocalization is confined to one ring.
Answered by | 25 Jul, 2014, 09:18: AM
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