Manipal MET2010ChemistryBiomolecules
Which of the following hexoses will form the same osazone when treated with excess phenyl hydrazine?
Options
- AD-glucose, D-fructose and D-galactose
- BD-glucose, D-fructose and D-mannose
- CD-glucose, D-mannose and D-galactose
- DD-fructose, D-mannose and D-galactose
Correct answer
B. D-glucose, D-fructose and D-mannose
Step-by-step solution
D-glucose, D-fructose and D-mannose form the same osazone when treated with excess of phenyl hydrazine because they differ only in Ist and 2nd carbon atoms which are transformed to the same form. They form the following osazone