Which of the following group is meta directing and ring deactivating

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$- OH$

$- Cl$

$- {NO}_{2}$

$- Br$

answer is C.

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Detailed Solution

Looking at the resonance structures reveals that the positive charge concentrates at the ortho-para positions because $— N O_{2}$ is an electron withdrawing group. These locations are thereby rendered inactive with respect to electrophilic aromatic substitution.

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