Asked in FBISE Chemistry 2022 — Paper 1 2022Moderate

Oxidative cleavage of Ethane-1, 2-diol (Glycol) with HIO4 gives:

Correct answer: A. Formaldehyde

  • A. Formaldehyde
  • B. Acetaldehyde
  • C. Methanol
  • D. Ethanol

Explanation

Formaldehyde (CHO): When ethane-1,2-diol undergoes oxidative cleavage, it forms two molecules of formaldehyde. This is because the carbon-carbon bond cleavage results in two aldehyde groups.

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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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