BIOLOGY
STRUCTURE OF GLUCOSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Glucose pentaacetate doesnot react with hydroxylamine. This indicates that ____
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CHO Group is absent
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CHO group is present but not free
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free CHO group is present
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cann’t predict
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Explanation:
Detailed explanation-1: -The pentaacetate of glucose does not react with hydroxylamine indicating the absence of free-CHO group.
Detailed explanation-2: -The pentaacetate of glucose does not react with hydroxylamine indicating the absence of free –CHO group.
Detailed explanation-3: -Pentaacetate of D-glucose in aqueous medium does not form open chain structure and thus when it reacts with NH2OH, it does not form oxime indicating that there is absence of free aldehyde (−CHO) group.
Detailed explanation-4: -When glucose reacts with hydroxylamine, oxime is formed and cyanohydrins are formed on the addition of hydrogen cyanide to it. This reaction can confirm the presence of carbonyl group in glucose.
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