Chemistry - Biomolecules Question with Solution | TestHub
For the complex conversion of D-glucose into the corresponding osazone, the minimum number of equivalents of phenyl hydrazine required is :
Answer:
Solution:
Question Explanation:
The question asks for the minimum number of equivalents of phenylhydrazine (PhNHNH₂) required to convert D-glucose into its osazone.
Concept :
This question is based on Osazone formation, Carbonyl reaction of sugars, Phenylhydrazine reaction
Solution :
During osazone formation:
One equivalent of phenylhydrazine reacts with the aldehyde group (C-1) to form a hydrazone. Second equivalent oxidizes the –CHOH group at C-2 to a carbonyl group.
Third equivalent reacts with this newly formed carbonyl group to form the second hydrazone.
Thus, a minimum of three equivalents of phenylhydrazine are required.