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Question

What observations suggest a cyclic structure for the glucose molecule?


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Solution

Glucose:

  • Glucose is a monosaccharide having a molecular formula C6H12O6.
  • It is an aldohexose.

Observations that suggested a cyclic structure for the glucose molecule:

  • Shiff's test is not given by Glucose even if it has an aldehyde group.
  • Hydrogen sulphite addition product is not formed with NaHSO3.
  • The reaction of pentaacetate of glucose with hydroxylamine does not take place. This shows the absence of free -CHO group.
  • Glucose is found in two crystalline forms called α and β.

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