Normally, the monosaccharides are reducing sugars!
Fehling's solution reacts with ALDEHYDES ONLY. Since sugars like glucose mannose contain aldehyde group, the fehling's solution reacts with them, producing brick red precipitate.
fructose is not an aldose, meaning that it doesn't have an aldehyde group.
But when fractose is dissolved in fehling's solution, due to basic pH of the solution It undergoes an equlibrium called “tautomerization” by which the keto group is readily converted to an aldehyde. and hence, it is able to react with fehling's solution and tollen’s reagent!
Normally, the monosaccharides are reducing sugars!
Fehling's solution reacts with ALDEHYDES ONLY. Since sugars like glucose mannose contain aldehyde group, the fehling's solution reacts with them, producing brick red precipitate.
fructose is not an aldose, meaning that it doesn't have an aldehyde group.
But when fractose is dissolved in fehling's solution, due to basic pH of the solution It undergoes an equlibrium called “tautomerization” by which the keto group is readily converted to an aldehyde. and hence, it is able to react with fehling's solution and tollen’s reagent!
A brown precipiate is formed when fructose is treated with Fehling's solution.
Fehling 's solution is alkaline. Under alkaline conditions, fructose is isomerized to a mixture of glucose and mannose.
A brown precipiate is formed when fructose is treated with Fehling's solution.
Fehling 's solution is alkaline. Under alkaline conditions, fructose is isomerized to a mixture of glucose and mannose.
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Normally, the monosaccharides are reducing sugars!
Fehling's solution reacts with ALDEHYDES ONLY. Since sugars like glucose mannose contain aldehyde group, the fehling's solution reacts with them, producing brick red precipitate.
fructose is not an aldose, meaning that it doesn't have an aldehyde group.
But when fractose is dissolved in fehling's solution, due to basic pH of the solution It undergoes an equlibrium called “tautomerization” by which the keto group is readily converted to an aldehyde. and hence, it is able to react with fehling's solution and tollen’s reagent!
Normally, the monosaccharides are reducing sugars!
Fehling's solution reacts with ALDEHYDES ONLY. Since sugars like glucose mannose contain aldehyde group, the fehling's solution reacts with them, producing brick red precipitate.
fructose is not an aldose, meaning that it doesn't have an aldehyde group.
But when fractose is dissolved in fehling's solution, due to basic pH of the solution It undergoes an equlibrium called “tautomerization” by which the keto group is readily converted to an aldehyde. and hence, it is able to react with fehling's solution and tollen’s reagent!
More
VOTE