Which of the following reactions are disproportionation reactions? Select the correct option from the following: [2019]

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Solution

Q.
Which of the following reactions are disproportionation reactions

(i)   $2 {Cu}^{+} ⟶ {Cu}^{2 +} + {Cu}^{0}$

(ii)   $3 {MnO}_{4}^{2 -} + 4 H^{+} ⟶ 2 {MnO}_{4}^{-} + {MnO}_{2} + 2 H_{2} O$

(iii)   $2 {KMnO}_{4} \overset{Δ}{\to} K_{2} {MnO}_{4} + {MnO}_{2} + O_{2}$

(iv)   $2 {MnO}_{4}^{-} + 3 {Mn}^{2 +} + 2 H_{2} O ⟶ 5 {MnO}_{2} + 4 H^{+}$

Select the correct option from the following:   [2019]

1 (i) and (iv) only

2 (i) and (ii) only

3 (i), (ii) and (iii)

4 (i), (iii) and (iv)

Ans.
(2)

Disproportionation reactions are those in which the same element gets oxidised and reduced simultaneously.

$2 {Cu}^{+} \to {Cu}^{2 +} + {Cu}^{0}$

$3 \overset{+ 6}{Mn} O_{4}^{2 -} + 4 H^{+} \to 2 \overset{+ 7}{Mn} O_{4}^{-} + \overset{+ 4}{Mn} O_{2} + 2 H_{2} O$

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