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KCET2026ChemistryAlcohols Phenols and Ethers

R- CH ₂ OH is converted into R- CHO by reacting with ________.

Options

  1. AAlkaline KMnO ₄
  2. BLiAlH ₄
  3. CNa / C ₂ H ₅ OH
  4. DPCC (Pyridinium Chlorochromate)

Correct answer

D. PCC (Pyridinium Chlorochromate)

Step-by-step solution

The conversion of a primary alcohol ( R- CH ₂ OH ) to an aldehyde ( R- CHO ) requires a mild oxidizing agent. Alkaline KMnO ₄ is a strong oxidizing agent and oxidizes primary alcohols directly to carboxylic acids ( R- COOH ). LiAlH ₄ and Na / C ₂ H ₅ OH are reducing agents and do not oxidize alcohols. PCC (Pyridinium Chlorochromate) is a mild oxidizing agent that selectively oxidizes primary alcohols to aldehydes, stopping the reaction at the aldehyde stage. Answer: PCC (Pyridinium Chlorochromate)

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