Which of the following is not a case of disproportionation reaction?

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${H C u C l}_{2} ⟶ C u + {C u}^{2 +} + H^{+} + C l^{-}$

${B r}_{2} + {O H}^{-} ⟶ {B r}^{-} + {B r O}^{-} + H_{2} O$

$C_{2} H_{5} C H O + {O H}^{-} ⟶ C_{2} H_{5} C O O^{-} + C_{2} H_{5} {C H}_{2} O H$

$H g S + O_{2} ⟶ H g + {S O}_{2}$

answer is D.

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Detailed Solution

Disproportionation reaction: A redox reaction involving simultaneous reduction and oxidation of atoms of the same element from one oxidation state (OS) to two different oxidation states

In the given options, options (A), (B) and (C) involves both oxidation and reduction

In case of option (D) mercury undergo only reduction and sulphur undergo only oxidation. So option (D) is not a disproportionation reaction

Hence the correct option is (D).

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