1.

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

Answer»

`-NO_(2)` group makes the ring electron RICH at ORTHO and para positions
`-NO_(2)` group withdraws electrons from meta position
`-NO_(2)` DONATES electron at meta position
`-NO_(2)` with drows electrons from ortho and para positions.

Solution : `:NO_(2)` withdraws w electrons from the carbon bearing chlorine group making the C-Cl bond WEAK


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