Fehling’s Solution –Fehling`s solution is a chemical test which is used to differentiate between water-soluble carbohydrate and ketone functional groups, and as a test for monosaccharides.It consist of Fehling`s A and Fehling`s B. Fehling`s A is a blue aqueous solution of copper(II) sulfate, while Fehling`s B is a clear and colorless solution of aqueous potassium sodium tartrate, known as Rochelle salt and a strong alkali which is commonly sodium hydroxide.1).Aldehydes are oxidized with this solution giving a positive result, but ketones do not react, unless they are alpha-hydroxy-ketones.2).Fehling`s test is used as a test for monosaccharides. It will give a positive result for aldose monosaccharides (due to the oxidisable aldehyde group) but also for ketose monosaccharides, as they are converted to aldoses by the base in the reagent, and then give a positive result.For this reason, Fehling`s reagent is sometimes referred to as a general test for monosaccharides.