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Question

What are the observations against an open-chain structure for the glucose molecule?


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Solution

Open-chain structure for the glucose

What is the open chain structure of glucose? - Quora
  • When glucose is heated with methyl alcohol in the presence of dry HCl gas, it produces two isomeric methyl glucosides.

C6H12O6+CH3OHαC6H11O6CH3+βC6H11O6CH3

  • The open chain structure of glucose does not predict this test.
  • Despite having an aldehydic group, glucose does not give the 2,4-DNP test, Schiff's test, or hydrogen sulphite addition product.
  • The ring structure of glucose explains this phenomenon.

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