Question

Which of the following is the most activating
in electrophilic aromatic substitution ?
•
(A)
- NO2
(B)
- NHCOCH3
(C) -CN
D
-NH2​

Answer 1

Answer:

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Explanation:

(B)

- NHCOCH3

Answer 2

NH₂ is the most activating in electrophilic aromatic substitution. (Option D)

• In electrophilic aromatic substitution, NH₂ is the most activating. It is an activating group because it is a powerful electron-donating group.
• The most deactivating groups are NO₂ and CN. They are an electron-withdrawing group with a lot of power.
• The NHCOCH₃ group is a mildly activating and ortho para directing group. The carbocation in the transition state is stabilized by the existence of unpaired electrons that can be contributed to the ring.
• Thus, NH₂ is the most activating in electrophile aromatic substitution. Option D is the answer.