α and β-fructose The two forms have different configuration about C2.
Fructose does not reduce Br2 water.
Epimers
Monosaccharides differing in configuration at a carbon other than anomeric carbon are called epimers, e. g., glucose and galactose differ in configuration at C4, hence called epimers.
Osazones
Monosaccharides and reducing disaccharides react with excess of phenyl hydrazine to form crystalline substances of the structure
It is known as osazones glucose and fructose give same osazone.