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JEE Advanced levelSingle correct optionDifficulty 3 of 3bm034

Consider aldohexoses in the pyranose ring form, where C-1 to C-5 are all stereocentres. The total number of stereoisomers (counting each anomer and each enantiomer separately) is

  1. A16
  2. B32
  3. C64
  4. D8

Answer: B

Open-chain aldohexoses have 4 stereocentres (16 isomers). Ring closure makes C-1 a fifth stereocentre, giving .
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