Answer
The correct answer is option (b) glucose.
Work Step by Step
Isomers have the same molecular formula but differ in structure and properties. There are different types of isomers as given below: Enantiomers: They are stereoisomers that are mirror images Diastereomers: They are stereoisomers that are not mirror images Glucose, galactose, and fructose are all stereoisomers. They have the same molecular formula but differ in the arrangement of groups in three-dimensional orientation. Glycogen is a polymer of glucose. It is a storage form of carbohydrate in animals. A polymer cannot be an isomer of monomers. Hence, option (a) is not correct.
Starch is a polymer of glucose. It is composed of amylose and amylopectin. It is a storage polysaccharide of plants. A polymer cannot be an isomer of monosaccharides. Hence, option (c) is not correct. Maltose is a disaccharide which results from digestion of amylose. It is composed of two glucose units. A disaccharide cannot be an isomer of a monosaccharide. Hence, option (d) is not correct.
Glucose is a monosaccharide and is a hexose. Both galactose and fructose are also hexoses. While glucose and galactose are stereoisomers, glucose and fructose are structural isomers. Hence, the correct answer is option (b) glucose.
