Assertion is true but Reason is false. Sucrose is formed by linkage of C1 of α - D glucose and C2 of β−D fructose. The glycosidic bond in sucrose is formed between reducing ends of both glucose and fructose. Sucrose is a disaccharide and a non-reducing sugar as it contains no free —CHO group (Anomeric carbon of both monosaccharides are involved in formation of glycosidic bond). The structure is as follows