Its used because, as soon as banzaldehyde is formed, it reacts with acetic anhydride to form benzyldiene acetate and thus further oxidation of benzaldehyde to benzoic acid is checked by acetic anhydride
C6H5 CH3 + CrO3 ---------> C6H5 CHO <====> C6H5CH(OCOCH3)2
where <===> implies reversible rxn....
Moderation Team
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