A naturally occurring disaccharide 'X' does not reduce Fehling's solution and does not exhibit mutarotation. Upon acidic hydrolysis, it yields two different monosaccharides. Identify the disaccharide 'X' and its exact glycosidic linkage.

Step-by-step solution

The inability to reduce Fehling's solution and the lack of mutarotation indicate that 'X' is a non-reducing sugar. This implies that both anomeric carbons of its constituent monosaccharides are locked in the glycosidic bond. Upon hydrolysis, it yields two different monosaccharides. This points to sucrose (which yields glucose and fructose) rather than a symmetrical non-reducing sugar like trehalose (which yields two glucose units). Sucrose is composed of -D-glucose and -D-fructose. The glycosidic linkage involves t