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

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

Answers:
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.
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