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Which reagent can convert CH3CH2OH into CH3CHO?

1. Catalytic hydrogenation
2. LiAlH4 treatment
3. Pyridinium chlorochromate (PCC) treatment
4. KMnO4 treatment

Correct answer: Pyridinium chlorochromate (PCC) treatment

Solution

PCC is a mild oxidant that converts a primary alcohol to the aldehyde without over-oxidising to the acid: CH3CH2OH -> CH3CHO. LiAlH4 and catalytic hydrogenation are reducing agents, and KMnO4 would oxidise all the way to the carboxylic acid.

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