Which of the following reactions is not a dis | vedclass

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(A) disproportionation reaction is a redox reaction where the same element is simultaneously oxidized and reduced.$1$. In $CaCO_3 \longrightarrow CaO

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$CaCO_3 \longrightarrow CaO + CO_2$

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(A) disproportionation reaction is a redox reaction where the same element is simultaneously oxidized and reduced.$1$. In $CaCO_3 \longrightarrow CaO + CO_2$,the oxidation states of $Ca$ $(+2)$,$C$ $(+4)$,and $O$ $(-2)$ remain unchanged. This is a thermal decomposition reaction,not a redox reaction.$2$. In $P_4 + 3 NaOH + 3 H_2O \longrightarrow 3 NaH_2PO_2 + PH_3$,$P$ goes from $0$ to $+1$ (oxidation) and $0$ to $-3$ (reduction).$3$. In $2 H_2O_2 \longrightarrow 2 H_2O + O_2$,$O$ in $H_2O_2$ $(-1)$ goes to $-2$ in $H_2O$ (reduction) and $0$ in $O_2$ (oxidation).$4$. In $2 Cu^+ \longrightarrow Cu^{2+} + Cu$,$Cu$ goes from $+1$ to $+2$ (oxidation) and $+1$ to $0$ (reduction).Therefore,the reaction in option $A$ is not a disproportionation reaction.

Which of the following reactions is not a disproportionation reaction?

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