What observations suggest a cyclic structure for the glucose molecule?

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Solution

Glucose:
Glucose is a monosaccharide having a molecular formula $C_{6} H_{12} O_{6}$ .
It is an aldohexose.
Observations that suggested a cyclic structure for the glucose molecule:
Shiff's test is not given by Glucose even if it has an aldehyde group.
Hydrogen sulphite addition product is not formed with ${NaHSO}_{3}$ .
The reaction of pentaacetate of glucose with hydroxylamine does not take place. This shows the absence of free $- CHO$ group.
Glucose is found in two crystalline forms called $α$ and $β$ .

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