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The decreasing order of reactivity of meta-nitrobromobenzene $(I), 2,4,6-$ trinitrobromobenzene $(II),$ para-nitrobromobenzene $(III)$, and $2,4-$ dinitrobromobenzene $(IV)$ towards $HO^-$ ions is
$1.86\, g$ of aniline completely reacts to form acetanilide. $10 \,\%$ of the product is lost during purification. Amount of acetanilide obtained after purification (in $g$) is ...... $\times 10^{-2}.$