Pick out the incorrect statement(s) from the following. 1. Glucose exists in two different crystalline forms, -D-glucose and -D-glucose. 2. -D-glucose and -D-glucose are anomers. 3. -D-glucose and -D-glucose are enantiomers. 4. Cellulose is a straight chain polysaccharide made of only -D-glucose units. 5. Starch is a mixture of amylase and amylopectin, both contain unbranched chain of -D-glucose units.

Step-by-step solution

Statement 1 is correct: Glucose exists in two crystalline forms, -D-glucose and -D-glucose, which differ in the configuration of the hydroxyl group at the C-1 carbon. Statement 2 is correct: -D-glucose and -D-glucose are anomers because they differ only in the configuration at the anomeric carbon (C-1). Statement 3 is incorrect: -D-glucose and -D-glucose are diastereomers, not enantiomers. Enantiomers are non-superimposable mirror images of each other, whereas anomers are a specific type of diastereomer. Statement