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(D) $1$. $A$ disproportionation reaction is a type of redox reaction in which the same element is simultaneously oxidized and reduced.$2$. In the $Can

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Cannizzaro reaction.

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(D) $1$. $A$ disproportionation reaction is a type of redox reaction in which the same element is simultaneously oxidized and reduced.$2$. In the $Cannizzaro$ reaction, aldehydes that do not have an $\alpha$-hydrogen atom undergo self-oxidation and reduction in the presence of a concentrated base.$3$. For example, two molecules of $benzaldehyde$ $(C_6H_5CHO)$ react to form $benzyl$ $alcohol$ $(C_6H_5CH_2OH)$ and $sodium$ $benzoate$ $(C_6H_5COONa)$.$4$. Here, the carbon atom in the aldehyde group is oxidized to a carboxylic acid salt and reduced to an alcohol simultaneously.$5$. Therefore, the $Cannizzaro$ reaction is a classic example of a disproportionation reaction.

Which of the following reactions is an example of a disproportionation reaction?

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