Benzene and Alkyl Benzene - Result Question 50-1
50. Give reasons in two or three sentences only for the following: Phenyl group is known to exert negative inductive effect, but each phenyl ring in biphenyl $\left(\mathrm{C}_6 \mathrm{H}_5-\mathrm{C}_6 \mathrm{H}_5\right)$ is more reactive than benzene towards electrophilic substitution.
(1992, 1M)
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Solution:

The above resonance activate an aromatic ring for electrophilic substitution reaction.