Why doesnt schiff twst doesnt guve fr fructos?
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glucose and fructose are monosaccharides and exhibit oxo-cyclo tautomerism. Glucose is an aldose and has aldehyde group in linear form. Whereas fructose is a ketose and doesn't give a positive Schiff test.
glucose and fructose are monosaccharides and exhibit oxo-cyclo tautomerism. Glucose is an aldose and has aldehyde group in linear form. Whereas fructose is a ketose and doesn't give a positive Schiff test.
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Glucose contains an aldehyde group in its open structure but forms a cyclic acetal structure(also called pyranose). This structure is quite stable and is not broken down by Schiff's reagent which is a weak base. Hence, it does not form hydrazone giving a negative Schiff's test.
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