Glucose and fructose are :
Correct statements among the following is / are
A.D - Glucose and L - glucose are enantiomers
B.α- D - Glucose and β- D - Glucose are anomers
C.Glucose and fructose are functional group isomers
D.D - glucose has 2R, 3R, 4S, 5R configuration
Why are glucose, fructose and galactose known as isomers?