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Which of the following reactions are disproportionation reactions?
(a) \( \mathrm{Cu}^{+} \longrightarrow \mathrm{Cu}^{2+}+\mathrm{Cu} \)
(b) \( 3 \mathrm{MnO}_{4}^{-}+4 \mathrm{H}^{+} \longrightarrow 2 \mathrm{MnO}_{4}^{-}+\mathrm{MnO}_{2}+2 \mathrm{H}_{2} \mathrm{O} \)
(c) \( 2 \mathrm{KMnO}_{4} \longrightarrow \mathrm{K}_{2} \mathrm{MnO}_{4}+\mathrm{MnO}_{2}+\mathrm{O}_{2} \)
(d) \( 2 \mathrm{MnO}_{4}^{-}+3 \mathrm{Mn}^{2+}+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow 5 \mathrm{MnO}_{2}+4 \mathrm{H}^{+} \)
(i) \( a, b \)
(ii) \( \mathrm{a}, \mathrm{b}, \mathrm{c} \)
(iii) b, c, d
(iv) \( a, d \)
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