Q. Which of the following hexoses will form the same osazone when treated with excess phenyl hydrazine?
A) D-glucose , D-fructose and D-galactose
B) D-glucose , D-fructose and D-mannose
C) D-glucose , D-mannose and D-galactose
D) D-fructose, D-mannose and D-galactose
Explanation
(b)
D-glucose, D-fructose and D-mannose from the same osazone when treated with excess of phenyl hydrazine because they differ only in Ist and 2^{nd} carbon atoms which are transformed to the same form.
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Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.