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Q.

Replacement of Cl of chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-dinitrochlorobenzene is readily replaced. This is because 

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a

NO2 makes the ring electron rich at ortho and para positions 

b

 NO2 withdraws e- from meta-position 

c

NO2 donates e- at m-position 

d

NO2 withdraws e- from ortho/para-positions 

answer is D.

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Detailed Solution

-NO2 group withdraws electrons from o- and p-positions and hence activates the —Cl present on that position towards nucleophilic substitution. 

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Replacement of Cl of chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-dinitrochlorobenzene is readily replaced. This is because