A chemist has treated P-chloroaniline with acetic anhydride and wants to separate the amine product from any unreacted amine which reagent used for separation based on the basicities of the two compounds.

Question

$ \begin{array}{1 1}(a)\;HNO_3\;and\;H_2SO_4&(b)\;5\%\;aqueous\;HCl\\(c)\;5\%\;CH_3COOH&(d)\;\text{None}\end{array}$