Which reaction does not represent auto redox or disproportionation?

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$\begin{aligned} {Cl}_{2} + {OH}^{-} ⟶ {Cl}^{-} + {ClO}_{3}^{-} + H_{2} O \end{aligned}$

${({NH}_{4})}_{2} {Cr}_{2} O_{7} ⟶ N_{2} + {Cr}_{2} O_{3} + 4 H_{2} O$

$\begin{array}{r} 2 {Cu}^{+} ⟶ {Cu}^{2 +} + Cu \end{array}$

$\begin{array}{r} 2 H_{2} O_{2} ⟶ H_{2} O + O_{2} \end{array}$

answer is D.

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Detailed Solution

The reaction ${({NH}_{4})}_{2} {Cr}_{2} O_{7} ⟶ N_{2} + {Cr}_{2} O_{3} + 4 H_{2} O$ represent Intramolecular redox reactions and not auto redox or disproportionation.

Thus, option D is correct.

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