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How do you explain the presence of an al...

How do you explain the presence of an aldehydic group in a glucose molecule?

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Glucose reacts with hydroxylamine `(NH_(2)OH)` to form a monoxime and adds one molecule of hydrogen cyanide (HCN) to give a cyanohydrin. Thus, glucose contains a carbonyl group, which may be aldehydic or ketonic in nature. However, glucose `(C_(6)H_(12)O_(6))` undergoes oxidation by bromine-water (a mild oxidising agent) to give gluconic acid `(C_(6)H_(12)O_(7))` with the same number of carbon atoms. This indicates that carbonyl group present in glucose is an aldehydic group.
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