Write any two reactions of glucose which cannot be explained by the open chain structure of glucose molecule.                          (2 marks)

(i) Despite having the aldehyde group, glucose does not give 2, 4-DNP test or Schiff's test.

(ii) It does not form the hydrogen sulphite addition product with ${\mathrm{NaHSO}}_{3}.$

(iii) The pentaacetate of glucose does not react with hydroxylamine indicating the absence of free

$-\mathrm{CHO}$ group.

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