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JEE Chemistry · Medium

Practical Organic Chemistry: Oxidation reactions MCQ

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Oxidation reactionsMediumQuestion 910005

Question

Which reagent converts a primary alcohol to an aldehyde WITHOUT over-oxidising to carboxylic acid?
  1. A
    PCC (pyridinium chlorochromate) in CH₂Cl₂
    Correct
  2. B
    KMnO₄
  3. C
    K₂Cr₂O₇/H₂SO₄
  4. D
    O₃

Correct answer

PCC (pyridinium chlorochromate) in CH₂Cl₂

Explanation

PCC (mild oxidant): 1° ROH → RCHO (stops at aldehyde). KMnO₄, K₂Cr₂O₇/H⁺ (strong oxidants): 1° ROH → RCOOH (full oxidation). 2° ROH → ketone with any oxidant.

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