Discussion
Which of the following oxidising agent is used to convert ethanol to ethanal?
Answer: E
The reagent is \(\text{CrO}_{3}\) in anhydrous medium.
To stop the oxidation of a primary alcohol at the aldehyde, a mild reagent is needed under conditions with no water: chromium trioxide in an anhydrous medium (or pyridinium chlorochromate) gives ethanal and goes no further.
Acidified and alkaline \(\text{KMnO}_{4}\) and acidified \(\text{K}_{2}\text{Cr}_{2}\text{O}_{7}\) are strong oxidants in water and carry the oxidation on to ethanoic acid. \(\text{H}_{2}\text{O}_{2}\) is not the reagent used for this conversion.
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