MHT CET Chemistry Question (2026) — Solution

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A disproportionation reaction is a redox reaction in which the same substance undergoes both oxidation and reduction simultaneously. In the Cannizzaro reaction, aldehydes lacking -hydrogens undergo self-oxidation and self-reduction in the presence of a concentrated base. One molecule of the aldehyde is reduced to the corresponding alcohol, while another molecule is oxidized to the salt of the corresponding carboxylic acid. For example: 2HCHO + NaOH HCOONa + CH_3OH Here, formaldehyde is oxidized to sodium formate and reduced to methanol. Thus, the Cannizzaro reaction is an example of a disproportionation reaction. Wolf-Kishner and Clemmensen reductions are purely reduction reactions, whereas Aldol condensation is a condensation reaction. Answer: Cannizzaro reaction.