Question:
Which of the following hexoses will form the same osazone when treated with excess phenyl hydrazine?
Which of the following hexoses will form the same osazone when treated with excess phenyl hydrazine?
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Which of the following hexoses will form the same osazone when treated with excess phenyl hydrazine?
Updated On: Apr 15, 2026
- D-glucose, D-fructose and D-galactose
- D-glucose, D-fructose and D-mannose
- D-glucose, D-mannose and D-galactose
- D-fructose, D-mannose and D-galactose
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Sugars that differ only at the $C_{1}$ and $C_{2}$ positions form the same osazone.
Step 2: Analysis
D-glucose, D-fructose, and D-mannose have identical configurations from $C_{3}$ to $C_{6}$.
Step 3: Conclusion
Upon reaction with phenyl hydrazine, these differences are removed, resulting in the same osazone.
Final Answer: (B)
Sugars that differ only at the $C_{1}$ and $C_{2}$ positions form the same osazone.
Step 2: Analysis
D-glucose, D-fructose, and D-mannose have identical configurations from $C_{3}$ to $C_{6}$.
Step 3: Conclusion
Upon reaction with phenyl hydrazine, these differences are removed, resulting in the same osazone.
Final Answer: (B)
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