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NCERT Textbook
BIOMOLECULES

Class 12
Chemistry :-NCERT Solution - Biomolecules

Exercise1 

Question 3
How do you explain the absence of the aldehyde group in the pentaacetate of D-glucose?


Answer:

D-glucose reacts with hydroxylamine (NH2OH) to form an oxime because of the presence of aldehydic (-CHO) group or carbonyl carbon. This happens as the cyclic structure of glucose forms an open chain structure in an aqueous medium, which then reacts with NH2OH to give an oxime.

 

But pentaacetate of D-glucose does not react with NH2OH. This is because pentaacetate does not form an open chain structure.


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