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Replacement of $Cl$ of chlorobenzene to give phenol requires drastic conditions but chlorine of $2,\,4-$ dinitrochlorobenzene is readily replaced because.
$1.86\, g$ of aniline completely reacts to form acetanilide. $10 \,\%$ of the product is lost during purification. Amount of acetanilide obtained after purification (in $g$) is ...... $\times 10^{-2}.$