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Least reactive compound towards ArSN reactions is

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answer is B.

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Detailed Solution

The negative charge delocalizes at ortho and para positions.

Presence of EWG (-NO₂) stablizes the carbanion.

D is most reactive.

$∵$ negative charge is not delocalized at meta position.

Any group at meta position has little or no effect.

-CH₃ group at para position — +I , +R effect ….EDG.

Presence of EDG destabilizes the carbanion.

B is least reactive.

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