Identify the non-reducing sugar.

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(D) sugar is considered non-reducing if it does not have a free hemiacetal or hemiketal group,meaning it cannot open to form an aldehyde or ketone in

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(D) sugar is considered non-reducing if it does not have a free hemiacetal or hemiketal group,meaning it cannot open to form an aldehyde or ketone in solution. In option $D$,the anomeric carbon is involved in a glycosidic linkage ($-OCH_3$ group),which prevents the ring from opening. Therefore,it cannot reduce Tollens' or Fehling's reagent,making it a non-reducing sugar.

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