(c) same osazonc
When sugars react with an excess of phenylhydrazine, a class of compounds known as osazone is formed.
Glucose and fructose differ in the arrangement of atoms around the C−1 and C−2 carbon. When both of them react with three molecules of phenylhydrazine, the formation of osazone crystals makes the difference between the carbon atoms in their chain and hence they form the same osazone.
