Which of the following species do not show disproportionation on reaction?
$C l O^{-}, C l O_{2}^{-}, C l O_{3}^{-}$ and $C l O_{4}^{-}$

C l O_{4}^{-}

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C l O_{3}^{-}

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C l O^{-}

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None of these

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Solution

The correct option is D $C l O_{4}^{-}$
Disproportionation is a specific type of redox reaction in which a species is simultaneously reduced and oxidised to form two different products.
Electronic configuration of Cl is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}$
It can exhibit an max. oxidation state of +7.
In the given question, All species can exhibit disproportionation reaction which simultaneously oxidise as well as reduce.
In ${C l O_{4}}^{-}$ , this cannot undergo oxidation as +7 is max. oxidation state exhibited by chlorine.

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Also, write the reaction for each of the species that disproportionate.

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