Question

The species which undergo disproportionation in alkaline medium is/are

• A. $C{l}_2$
• B. $Mn{O}_4^{-}$
• C. $N{O}_2$
• D. All

Answer 1

Answer: (D)

Disproportionation is a specific type of redox reaction in which a species is simultaneously reduced and oxidised to form two different products.
$InC{l}_2$, oxidation state of $Cl$ is 0 so it can give disproportionation reaction because $Cl$ shows oxidation state from $-1$ to $+7$.

In $Mn{O}_4{}^{2-}$, oxidation state of $Mn$ is $+6$ so it can give disproportionation reaction because Mn shows oxidation state of $+2,+3,+4,+6,+7$.
In $N{O}_2$, 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.