1. Sucralose: Derived from sucrose by replacing three hydroxyl groups with chlorine atoms. Sucrose is a disaccharide containing a glycosidic linkage between glucose and fructose units. Since sucralose retains this core structure, it also contains a glycosidic linkage. Therefore, Sucralose fits the description for X. 2. Alitame: It is a dipeptide amide, specifically L -alanine + D -aspartic acid + an amine. It contains amide linkages due to the peptide bonds. However, it does not contain an ester linkage. Therefore, Alitame does not fit the description for Y (which requires both amide and ester linkages). 3. Aspartame: It is a methyl ester of a dipeptide (L-aspartyl-L-phenylalanine). It contains an amide linkage (peptide bond) between aspartic acid and phenylalanine. It also contains an ester linkage (the methyl ester of the phenylalanine carboxyl group). Therefore, Aspartame fits the description for Y as it contains both amide and ester linkages. 4. Saccharin: It is a sulfimide derivative (1,2-benzisothiazol-3(2H)-one 1,1-dioxide). It does not contain glycosidic, amide, or ester linkages. Therefore, Saccharin does not fit the description for X or Y .
