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Glucose reacts with acetic anhydride to give a pentaacetate. This shows that glucose contains

  1. Afive aldehyde groups
  2. Bfive hydroxyl groups
  3. Cfive carbon atoms in the chain
  4. Da ring of five atoms

Answer: B

Each acetyl group replaces the H of one -OH group, so five acetyl groups mean five -OH groups.
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