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Discussion

A high iodine value in an oil indicates a large proportion of

  • A.dissolved paraffin wax
  • B.inorganic ash-forming matter
  • C.unsaturated compounds
  • D.saturated hydrocarbons

Answer: C

Correct answer: unsaturated compounds

The iodine value measures how much iodine the oil will add across its double bonds, so it is a direct count of unsaturation. It matters because unsaturated compounds oxidise readily, thickening the oil and forming gums and acids, so a low iodine value indicates better oxidation stability.

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