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How do you explain the absence of aldehyde group in the pentaacetate of D-glucose ? |
Answer» Solution : corresponding oxime . Thus , glucose contains an aldehydic group. In contrast, when glucose is reacted with acetic anhydride. Anhydride , the OH group at `C-1`, along with the four other OH GROUPS at `C-2,C-3,C-4` and `C-6` form a PENTAACETATE. Since the pentaacetate of glucose does not CONTAIN a free OH group at `C-1` , it cannot get hydrolysed in aqueous solution to PRODUCE theopen CHAIN aldehydic form and hence glucose this proves that glucose pentaacetate does not contain the aldehyde group. |
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