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How will you prove the presence of aldeh...

How will you prove the presence of aldehyde group in glucose ?

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(i) Glucose is oxidised to gluconic acid with ammoniacal silver nitrate (Tollen.s reagent) and alkaline copper sulphate (Fehling.s solution). Tollen.s reagent is reduced to metallic silver and Fehling.s solution to cuprous oxide (red precipitate). These reactions confirm the presence of an aldehye group in glucose.
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Write a reaction that indicates the presence of an aldehyde group in glucose.