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Write any two reactions of glucose which...

Write any two reactions of glucose which cannot be explained be the open chain structure of glucose molecule.

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(i) Despite having the aldehyde group, glocuse does not give, `2,-4- DNP` test, shciff's test and it does not form the hydrogen sulphide addition product with `NaHSO_(3)`.
(ii) The penta acetate of glucose does not react with hydroxilamine indicating the absence of free-CHO group.
(iii) Glucose is found to exist in two different crystalline forms which are names as a and b.
The a-form of glucose (M.P. 419K) is obtained by crystallisation from concentrated solution and saturated aqueous solution at `371 K`.
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