Which of the following reagents CANNOT be used to make benzoic acid from benzaldehyde?A.CrO3B.KMnO4C.H2CrO4D.PCC
Question
Which of the following reagents CANNOT be used to make benzoic acid from benzaldehyde?A.CrO3B.KMnO4C.H2CrO4D.PCC
Solution
The reagent that cannot be used to make benzoic acid from benzaldehyde is D. PCC (Pyridinium chlorochromate).
Here's why:
A. CrO3 (Chromium trioxide), B. KMnO4 (Potassium permanganate), and C. H2CrO4 (Chromic acid) are all strong oxidizing agents. They can oxidize aldehydes to carboxylic acids. In this case, they can oxidize benzaldehyde to benzoic acid.
D. PCC (Pyridinium chlorochromate) is a milder oxidizing agent. It can oxidize primary alcohols to aldehydes and secondary alcohols to ketones. However, it does not further oxidize aldehydes to carboxylic acids. Therefore, PCC cannot be used to make benzoic acid from benzaldehyde.
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