1.

Give reasons as the evidence in support of cyclic structure of glucose.

Answer» Correct Answer - (i) Though glucose has aldehyde group, it does not give `2,4-DNP` test
(ii) It does not form hydrogen sulphite addition product
(iii) The pentacetate of glucose does not react with hydroxyl amine.
Amino facts indicate the absence of free `-CHO` group in glucose.
(i) Though glucose has aldehyde group, it does not give `2,4-DNP` test
(ii) It does not form hydrogen sulphite addition product
(iii) The pentacetate of glucose does not react with hydroxyl amine.
Amino facts indicate the absence of free `-CHO` group in glucose.


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