Question:
Write the reactions involved when D-glucose is treated with the following reagents: (a) HCN (b) Br\(_2\) water
Write the reactions involved when D-glucose is treated with the following reagents: (a) HCN (b) Br\(_2\) water
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Cyanohydrin formation is a typical nucleophilic addition reaction, and oxidation with bromine water converts aldehydes to carboxylic acids.
Updated On: Mar 1, 2025
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Solution and Explanation
(a) Reaction of D-glucose with HCN: When D-glucose is treated with hydrogen cyanide (HCN), it undergoes cyanohydration to form a cyanohydrin, specifically D-glucose cyanohydrin. \[ \text{D-glucose} + HCN \rightarrow \text{D-glucose cyanohydrin} \]
(b) Reaction of D-glucose with Br\(_2\) water: When D-glucose is treated with bromine water, it undergoes oxidation at the aldehyde group. This converts the aldehyde group to a carboxylic acid group, and the product is gluconic acid. \[ \text{D-glucose} + Br_2 \text{(water)} \rightarrow \text{Gluconic acid} \]
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