Why sucrose not oxidised by Benedict reagent?

Because sucrose is not reducing sugar. In order for sugar to be oxidised by Benedict reagent it has to contain aldehyde group or has to isomerise in the solution to get one. This is possible for all monosaccharides. But not for all disacharides. read more

Benedict’s reagent reacts with the reducing end of a sugar, sucrose, as disaccharide of glucose and fructose are bonded such that there is no reducing ends to the sugar molecule so there is no reaction with benedict’s reagent. read more

Benedict's reagent can be used to test for the presence of glucose in urine. Glucose in urine is called glucosuria and can be indicative of diabetes mellitus, but the test is not recommended or used for the diagnosis of diabetes mellitus. read more