Sucrose is not a reducing sugar since

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(A) Carbohydrates that can reduce Tollen's reagent or Fehling's solution are called reducing sugars. All monosaccharides and most disaccharides (excep

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it contains no free aldehyde or keto group adjacent to $ >CHOH $ group

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(A) Carbohydrates that can reduce Tollen's reagent or Fehling's solution are called reducing sugars. All monosaccharides and most disaccharides (except sucrose) are reducing sugars.In sucrose,the glycosidic linkage is formed between the $C1$ of glucose and $C2$ of fructose. Since both the anomeric carbons are involved in the linkage,there is no free aldehyde or keto group available to act as a reducing agent. Therefore,it fails to react with Tollen's reagent and Fehling's solution.

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