During potassium permanganate oxidation in PAS, aldehyde groups are overoxidized to which state?

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Multiple Choice

During potassium permanganate oxidation in PAS, aldehyde groups are overoxidized to which state?

Explanation:
Potassium permanganate is a stronger oxidant than the periodic acid step in PAS. The aldehyde groups formed from periodic acid oxidation are further oxidized by KMnO4 to carboxylic acids (the acid state). This overoxidation removes the aldehyde functionality, so Schiff reagent would no longer detect those sites. Therefore, aldehydes are converted to the acid form, not to an alcohol or a ketone.

Potassium permanganate is a stronger oxidant than the periodic acid step in PAS. The aldehyde groups formed from periodic acid oxidation are further oxidized by KMnO4 to carboxylic acids (the acid state). This overoxidation removes the aldehyde functionality, so Schiff reagent would no longer detect those sites. Therefore, aldehydes are converted to the acid form, not to an alcohol or a ketone.

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