For which of the following G, above reaction will be the fastest?

-OH

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{- CH}_{3}

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{- NO}_{2}

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-CHO

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Solution

The correct option is C ${- NO}_{2}$
Since the reaction is nucleophile substitution reaction and nucleophile will attack fastly only one when a ring is a very much electron deficient. So, $- N O_{2}$ group enhances the rate of reaction more as it withdraws the electrons from the ring.

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