Glucose and fructose form

Options

A. Same osazone
B. Same acid on oxidation
C. Same alcohol when reduced
D. Different osazone

Answer

A

Explanation

Osazones formation test involves the reaction of a reducing sugar (free carbonyl group) with excess of phenylhydrazine when kept at boiling temperature. All reducing sugars form osazones.
Glucose – D and Fructose – D, differ in their structures in `C_1` and `C_2` . When they are reacted with phenyl hydrazine these two C – atoms get involved in the reaction and thus structural difference disappears with the formation of same osazone as the structures from `C_3` to `C_6` being same in both the structures.