1.

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

Answer»

`-NO_(2)` group makes the RING electron rich at ORTHO and para position
`-NO_(2)` group withdraws ELECTRONS from position
`-NO_(2)` donates electrons at META position
`-NO_(2)` withdraws electrons from ortho and para position.

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