{"id":19902,"date":"2024-04-15T05:45:46","date_gmt":"2024-04-15T05:45:46","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=19902"},"modified":"2024-04-15T05:45:46","modified_gmt":"2024-04-15T05:45:46","slug":"among-formaldehyde-acetaldehyde-and-benzaldehyde-the-aldehydes-which-undergo-cannizzaros-reaction-are-a-all-the-three-b-formaldehyde-and-acetaldehyde-c-acetaldehyde-and-benzaldehyde-d-formalde","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/among-formaldehyde-acetaldehyde-and-benzaldehyde-the-aldehydes-which-undergo-cannizzaros-reaction-are-a-all-the-three-b-formaldehyde-and-acetaldehyde-c-acetaldehyde-and-benzaldehyde-d-formalde\/","title":{"rendered":"Among formaldehyde, acetaldehyde and benzaldehyde, the aldehydes which undergo Cannizzaro’s reaction are A. all the three B. formaldehyde and acetaldehyde C. acetaldehyde and benzaldehyde D. formaldehyde and benzaldehyde"},"content":{"rendered":"

[amp_mcq option1=”all the three” option2=”formaldehyde and acetaldehyde” option3=”acetaldehyde and benzaldehyde” option4=”formaldehyde and benzaldehyde” correct=”option2″]<\/p>\n

The correct answer is B. Formaldehyde and acetaldehyde.<\/p>\n

Cannizzaro’s reaction is a chemical reaction between two aldehydes in the presence of a base. The reaction involves the oxidation of one aldehyde to the corresponding carboxylic acid and the reduction of the other aldehyde to the corresponding alcohol.<\/p>\n

Formaldehyde and acetaldehyde are both primary aldehydes. Primary aldehydes can undergo Cannizzaro’s reaction because they have a hydrogen atom on the \u00ce\u00b1-carbon atom. This hydrogen atom is abstracted by the base, which creates a carbanion. The carbanion then attacks the carbonyl group of the other aldehyde, resulting in the formation of a tetrahedral intermediate. The tetrahedral intermediate collapses, resulting in the formation of the carboxylic acid and the alcohol.<\/p>\n

Benzaldehyde is a secondary aldehyde. Secondary aldehydes cannot undergo Cannizzaro’s reaction because they do not have a hydrogen atom on the \u00ce\u00b1-carbon atom. Therefore, the base cannot abstract a hydrogen atom from the secondary aldehyde, and the reaction cannot proceed.<\/p>\n

Here is a diagram of the Cannizzaro reaction between formaldehyde and acetaldehyde:<\/p>\n

In this reaction, formaldehyde is oxidized to formic acid and acetaldehyde is reduced to ethanol.<\/p>\n","protected":false},"excerpt":{"rendered":"

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