Benzaldehyde is obtained from toluene by

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Cannizzaro reaction

Rosenmund's reduction

Kolbe's reaction

Etard reaction

answer is D.

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Detailed Solution

Given data: we have to find out from above in which reaction benzaldehyde is formed from toluene.

Explanation:

Rosenmund’s reduction: It is the hydrogenation of acyl chloride ion presence of Pd- catalyst.

Cannizzaro reaction: Aldehydes which do not have an α-hydrogen, will undergo self-oxidation and reduction reaction in presence of conc. base.Kolbe’s reaction: In this phenoxide react with $C O_{2}$ to form ortho-hydroxybenzoic acid. Etard reaction: Chromyl chloride oxidizes toluene to a chromium complex, which on hydrolysis gives benzaldehyde.

Hence the correct option is: (D). Etard reaction.

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