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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm233

Which of the following statements about the open-chain sugar shown is/are correct?

  1. AIt is an aldohexose.
  2. BIt has four stereocentres.
  3. CReduction with gives an optically inactive (meso) alditol.
  4. DEach molecule has five hydroxyl groups, so it can form a pentaacetate with excess acetic anhydride.

Answer: A, B, D

The compound is D-glucose: CHO plus six carbons gives an aldohexose, with stereocentres C-2 to C-5 (four). It has five OH groups, so one molecule can take up five acetyl groups. NaBH4 gives D-glucitol, which is optically active because its stereocentres are not mirror-related (checked: not meso), so the third statement is false.
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