Question

# What observations suggest a cyclic structure for the glucose molecule?

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Solution

## Glucose:Glucose is a monosaccharide having a molecular formula ${\mathrm{C}}_{6}{\mathrm{H}}_{12}{\mathrm{O}}_{6}$.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 ${\mathrm{NaHSO}}_{3}$. The reaction of pentaacetate of glucose with hydroxylamine does not take place. This shows the absence of free $-\mathrm{CHO}$ group. Glucose is found in two crystalline forms called $\mathrm{\alpha }$ and $\mathrm{\beta }$.

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