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The most suitable reagent for the conversion of R – CH2 – OH → R – CHO is:

1. KMnO4
2. K2Cr2O7
3. CrO3
4. PCC (Pyridinium chlorochromate)

Correct answer: PCC (Pyridinium chlorochromate)

Solution

Pyridinium chlorochromate (PCC) is a mild oxidant that converts a primary alcohol R-CH2-OH to the aldehyde R-CHO without over-oxidising to the carboxylic acid, unlike KMnO4, K2Cr2O7 or CrO3. So PCC is the most suitable reagent.

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