Oxidation of toluene with $C r O_{3}$ to benzaldehyde is carried out in the presence of acetic anhydride. Explain why.

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Solution

Oxidation of Toluene with $C r O_{3}$ :
The oxidation of toluene to benzaldehyde is carried out in presence of acetic anhydride due to following reasons:
To carry out the oxidation of the methyl group of toluene to the aldehyde by the complex formation followed by hydrolysis.
To reduce the corrosive nature of the system and give a better yield of benzaldehyde.
To prevent the further oxidation of benzaldehyde to benzoic acid.

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