in biochemistry why sucrose does not react with benedicts solution until treated with acid?

Question

i did a test in food. i added sucrose with benedicts solution and put it in hot water for 10 min, i then took it out of the water and cooled it down, it had not changed colour until i treated it with acid and it became an orange colour after another 10 min in the water

Answer 1

Sucrose is a double sugar (disaccharide) of glucose and fructose. Glucose is a reducing sugar (reacts with Benedict's, Fehling's, and Tollen's solutions), because of the oxidation of it's aldehyde (-CH=O) group. Fructose is a reducing sugar because of the oxidation of its keto (>C=O) group. In sucrose, the glucose is bound through its aldehyde group to the keto group of fructose. Therefore, sucrose is a nonreducing sugar, because the two groups are masked. Treatment with acid hydrolyzes sucrose to glucose and fructose, and the sugar mixture reduces Benedict's solution.

Answer 2

this question was asked and resolved recently...you should really look for answers already published before posing the same question again!!