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MHT CET202616 April 2026Evening ShiftChemistryAlcohols Phenols and EthersActual

Which of the following reagents limits the oxidation of R-CH ₂ OH up to R-CHO only?

Options

  1. APCC
  2. BCrO ₃
  3. CK ₂ Cr ₂ O ₇ / dil. H ₂ SO ₄
  4. DKMnO ₄ (acidic)

Correct answer

A. PCC

Step-by-step solution

Primary alcohols ( R-CH ₂ OH ) can be oxidized to aldehydes ( R-CHO ) or carboxylic acids ( R-COOH ) depending on the oxidizing agent used. Strong oxidizing agents like acidic KMnO ₄ , K ₂ Cr ₂ O ₇ / dil. H ₂ SO ₄ , and CrO ₃ in aqueous medium oxidize primary alcohols directly to carboxylic acids. To limit the oxidation to the aldehyde stage, mild oxidizing agents are required. Pyridinium chlorochromate (PCC) is a mild oxidizing agent that selectively oxidizes primary alcohols to aldehydes and prevents further oxid

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