Question

Identify $P$ and $Q$ products in given reaction
$KI + MnO_{4}^{-} \xrightarrow{H^{+}} P + Mn^{2+}$
$KI + MnO_{4}^{-} \xrightarrow{OH^{-}} IO^{-}_{3}+ Q$

• A. $IO_{3}^{-}, MnO_{2}$ respectively
• B. $I_{2}, Mn^{2+}$ respectively
• C. $IO_{3}^{-}, Mn^{2+}$ respectively
• D. $I_{2}, MnO_{2}$ respectively

Answer 1

Answer: (D)

In acidic medium, $MnO_{4}^{-}$ reduces is $Mn^{2+}$ and oxidises $I^{-}$ to $I_{2}$.
$\therefore KI + MnO_{4}^{-} \xrightarrow{H^{+}} I_{2} + Mn^{2+}$
In basic medium, $MnO_{4}^{-}$ reduces to $MnO_{2}$ and produces $IO_{3}^{-}$.
$ \therefore KI + MnO_{4}^{-} \xrightarrow{OH^{-}} MnO_{2} + IO_{3}^{-}$