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Question
Write a chemical reaction to show that the open structure of D-glucose contains the following :
Aldehyde as a carbonyl group
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Solution
Glucose gets oxidized to six carbon carboxylic acid (gluconic acid) on reaction with a mild oxidizing agent like bromine water. This indicates that the carbonyl group is present as an aldehydic group
\[\begin{array}{cc}
\phantom{..}\ce{CHO}\phantom{...........} \ce{COOH}\phantom{...}\\
\phantom{......}|\phantom{.................}|\phantom{............}\\
\ce{(CHOH) ->[Br2/H2O][{[O]}](CHOH)4}\\
\phantom{..}|\phantom{.................}|\phantom{.......}\\
\phantom{..}\ce{\underset{\text{Glucose}}{CH2OH}} \phantom{.........}\ce{\underset{\text{Gluconic acid}}{CH2OH}}
\end{array}\]
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