Replacement of $Cl$ of chlorobenzene to give phenol requires drastic conditions but chlorine of $2,\,4-$ dinitrochlorobenzene is readily replaced because.
A$NO_2$ make ring electron rich at ortho and para
B$NO_2$ withdraws $e^-$ from meta position
Cdenotes $e^-$ at meta position
D$NO_2$ withdraws $e^-$ from ortho/para positions
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D$NO_2$ withdraws $e^-$ from ortho/para positions
d $-\mathrm{NO}_{2}$ by pulling electrons from $o/p-$ positions makes $\mathrm{C}-\mathrm{C}l$ bond weak
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