The order of leaving tendency is
$C l^{-}>R C O O^{-}>R O^{-}>N H_{2}^{-}$ and therefore, the order of reactivity of acyl compound is as
$\mathop {ACOCl}\limits_{(Acyl\,chloride)} > \mathop {\begin{array}{*{20}{c}}
{^{RCO}\backslash } \\
{_{RCO}/}
\end{array}O}\limits_{(Acid\,anhydride)} > \mathop {RCOOR}\limits_{(Ester)} > \mathop {RCON{H_2}}\limits_{(Amide)} $
ટોલ્યુઇન, નાઈટ્રોબેન્ઝીન, ઝાયલીન, ક્યુમીન, એનીલીન, ક્લોરોબેન્ઝીન, $m$નાઈટ્રોએનીલીન, $m-$ડાયનાઈટ્રોબેન્ઝીન