Primary alcohol can be converted into carboxylic acid by:
Correct answer: D. H₂SO₄/K₂Cr₂O₇
- A. CH₃COOH/P₂O₅
- B. NH₃
- C. CH₃OH
- D. H₂SO₄/K₂Cr₂O₇
Explanation
Acidified potassium dichromate, H2SO4 with K2Cr2O7, oxidises a primary alcohol first to an aldehyde and then to a carboxylic acid, turning from orange to green. Acetic acid with P2O5 is a dehydrating mixture, and NH3 and methanol are not oxidising agents.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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About Alcohols
Alcohols contain a hydroxyl group attached to a saturated carbon atom and are classified as primary, secondary or tertiary. Their nomenclature, hydrogen bonding, acidity, oxidation, dehydration, reaction with sodium and conversion to haloalkanes are covered, along with the distinction between alcohols and phenols, where the hydroxyl group is attached directly to an aromatic ring.
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