A)
B)
C)
D) None of these
Correct Answer: A
Solution :
During electrophilic substitution, the substituent already present in the benzene ring directs the incoming group either to ortho and para or to meta position and the reaction may be faster or slower as compared to benzene. All groups which activate the ring, ie, increase the reaction rate are o, p-directing. Activating groups increase the electron density in the benzene nucleus either due to inductive effect (+J effect) or resonance or both. Therefore, electrophile will attack on benzene nucleus easily. Halogens are exceptions in the sense that they deactivate the ring, but are o, p-directing. Hence, \[-O{{C}_{2}}{{H}_{5}}\] is the most activating group while \[-Cl,-COC{{H}_{3}}\] are deactivating groups.
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