SELECT * FROM question_mgmt as q WHERE id=2033 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=69 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 12th chemistry Biomolecules how do you explain the absence of aldehyde group i

Question:

How do you explain the absence of 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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