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Q.

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating

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a

-NO2

b

-C≡N

c

−SO3H

d

-COOH

answer is A.

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Detailed Solution

  • Nitro (−NO2​) group is most deactivating  in electrophilic aromatic substitution.
  • The deactivating effect is due to inductive and resonance effects.
  • −NO2​, −C≡N and −SO3​H are strongly deactivating groups.
  • −COOH is  moderately deactivating group.
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