Q.

Which of the following structures represents α - D - glucopyranose

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a

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b

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c

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d

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answer is A.

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Detailed Solution

  • In aqueous solution, more than 99% of glucose molecules, exist in cyclic isomeric form.
  • This conversion to a ring form arises from the open-chain form by a nucleophilic addition reaction between the aldehyde group at C-1 and the hydroxyl group at C-4 (or) C-5, yielding a hemiacetal group -C(OH)H-O-, at C-1
  • The reaction between C-1 and C-5 creates a molecule with a six-membered ring, called pyranose.
  • The position of the hydroxyl on the C-1 determines the alpha or the beta form of the pyranose.

 

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