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Enumerate the reactions of D-glucose whi...

Enumerate the reactions of D-glucose which cannot be explained by its open chain structure.

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The open chain structure of D-glucose can explain most of its properties but the following reactions could not be explained by this structure.

(i) Despite having the aldehyde group, glucose does not give 2,4-DNP test, Shiff.s reagent test, and it does not form the hydrogen sulphite addition product with `NaHSO_3`.
(ii) Acetylation of glucose with acetic anhydride gives glucose pentaacetate in which the five-OH groups present in glucose are acetylated.
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