Question

"glucose gives characteristic reactions of aldehydes" . explain this statement by giving the reaction with the relevant reagent.
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Answer 1

In aqueous solution, α-anomer and β-anomer of glucose remain in equilibrium with each other along with a small amount of glucose in open chain form (0.02 %0.02 %). The open chain form in the solution contains a free aldehydic group and hence gives several reactions involving free aldehyde.

Though little, the open chain form of glucose reacts with many reagents which are used to treat free aldehydic groups. Therefore, glucose in aqueous solution also reacts with those reagents.

glucose(aq)+HCN⟶gluco cyanohydringlucoseX(aq)+HCN⟶gluco cyanohydrin

glucose(aq)+H2NOH⟶gluco oximeglucoseX(aq)+HX2NOH⟶gluco oxime

glucose(aq)+

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