Answer:
D-glucose exists in two anomeric forms, in cyclic forms.
Open structure has following drawbacks
(i) It does not form addition compounds with and
Grignard reagent thus, indicating absence of ?CHO group. [1]
(ii) It does not give Schiff's test. [1]
(iii) Pent acetate of glucose does not react with hydroxyl
ammine. [1]
All these facts can be explained if we take cyclic structure.
glucose
differs in configuration about numeric carbon.
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