$C_{6} H_{5} C H_{3} \to_{C r O_{3}}^{{(C H_{3} C O)}_{2}} M \to_{h y d r o l y s i s}^{A l k a l i n e} C_{6} H_{5} C H O$
In this reaction acetic anhydride is used

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As an oxidising agent

To help the reaction to proceed smoothly

As a catalyst

To form a non–oxidizable derivative of benzaldehyde

answer is C.

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Detailed Solution

Acetic anhydride is used to prevent the oxidation of benzaldehyde, which would otherwise result in the production of benzoic acid. This can be explain with the above equation.

Hence , the correct option is (C).To form a non–oxidizable derivative of benzaldehye.

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