The sequence of reagents which convert $p-$methyl aniline to $p-$methyl benzoic acid are
- A$KMnO_4 / H^{+} ; NaNO_2 + HCl ; Cu / HCl$
- B$NaNO_2 + HCl / 273 \ K ; Cu / HCl ; KMnO_4 / H^{+}$
- C$NaNO_2 + HCl / 273 \ K ; CuCN / KCN ; H_3O^{+}$
- D$NaNO_2 + HCl / 285 \ K ; KCN ; H_3O^{+}$
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