<Tr> <Th> Analytes </Th> <Td> Reducing sugars </Td> </Tr> <P> Benedict's reagent (often called Benedict's qualitative solution or Benedict's solution) is a chemical reagent named after an American chemist, Stanley Rossiter Benedict . </P> <P> It is a complex mixture of sodium carbonate, sodium citrate and copper (II) sulfate pentahydrate,, which is often used in place of Fehling's solution to detect the presence of reducing sugars . The presence of other reducing substances also gives a positive reaction . Such tests that use this reagent are called the Benedict's tests . A positive test with Benedict's reagent is shown by a colour change from clear blue to a brick - red precipitate . </P> <P> Generally, Benedict's test detects the presence of aldehydes, alpha - hydroxy - ketones, also by hemiacetal, including those that occur in certain ketoses . Thus, although the ketose fructose is not strictly a reducing sugar, it is an alpha - hydroxy - ketone, and gives a positive test because it is converted to the aldoses glucose and mannose by the base in the reagent . </P>

What would give a positive result with the benedicts test