Question: In which one of the following sets all species show disproportionation reaction?
$\mathrm{ClO}_{2}^{-}, \mathrm{F}_{2}, \mathrm{MnO}_{4}^{-}$and $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$
$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}, \mathrm{MnO}_{4}^{-}, \mathrm{ClO}_{2}^{-}$and $\mathrm{Cl}_{2}$
$\mathrm{MnO}_{4}^{-}, \mathrm{ClO}_{2}^{-}, \mathrm{Cl}_{2}$ and $\mathrm{Mn}^{3+}$
$\mathrm{ClO}_{4}^{-}, \mathrm{MnO}_{4}^{-}, \mathrm{ClO}_{2}^{-}$and $\mathrm{F}_{2}$
Correct Option: , 3
Solution:
No option contains all species that show disproportionation reaction.
$\mathrm{MnO}_{4}^{-}$
Mn is in $+7$ oxidation state (highest) hence cannot be simultaneously oxidized or reduced.
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