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The nucleophilic substitution reactions ...

The nucleophilic substitution reactions taking place in aromatic system are designated as SN Ar In fact aryl halides do not easily undergo nucleophilic substitution under ordinary conditions. However, introduction of electron- withdrawing groups in o, p – positions makes the reaction to go faster. Keeping these general points in view answer the following questions
Which of the following undergo nucleophilic substitution at a faster rate with a given nucleophilic

A

B

C

D

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The correct Answer is:
D
As it contains two EWG - `S_(N) Ar` is faster than others
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