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  4. The species which undergo disproportionation in alkaline medium is/are

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Q. The species which undergo disproportionation in alkaline medium is/are

NTA AbhyasNTA Abhyas 2020Redox Reactions

Solution:

Disproportionation is a specific type of redox reaction in which a species is simultaneously reduced and oxidised to form two different products.
$In Cl _{2}$, oxidation state of $Cl$ is 0 so it can give disproportionation reaction because $C l$ shows oxidation state from $-1$ to $+7$.

In $MnO _{4}{ }^{2-}$, oxidation state of $Mn$ is $+6$ so it can give disproportionation reaction because Mn shows oxidation state of $+2,+3,+4,+6,+7$.
In $NO _{2}$, oxidation state of $N$ is $+4$ so it can give disproportionation reaction because $N$ shows oxidation state from $-3$ to $+5$. be reduced so it cannot give disproportionation reaction.