A) Aniline
B) Nitrobenzene
C) Benzoicacid
D) Acetanilide
Correct Answer: A
Solution :
The activating substituents make the benzene ring more reactive towards electrophilic substitution reaction while the deactivating substituents make the benzene ring less reactive towards electrophilic substitution reaction.\[-\text{N}{{\text{H}}_{\text{2}}}\] group is the most activating group which is present in aniline \[({{C}_{6}}{{H}_{5}}-N{{H}_{2}})\]hence it is the most reactive towards electrophilic substitution reaction.
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