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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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Open chain structure of glucose molecule cannot explain the following :
(i) Glucose does not react with sodium bisulphite `(NaHSO_(3))` to form addition product though it has aldehyde group
(ii) Glucose does not give Schiff.s test and 2,4-DNP test like other aldehydes.
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