Question

Which among the following reagents is used to obtain gluconic acid from glucose?

Options

• Acetic anhydride

• Acetyl chloride

• Bromine water

• dil. Nitric acid

Answer 1

Bromine water

Explanation:

When glucose is treated with bromine water, it undergoes oxidation, forming gluconic acid. (In this aldehydic group is oxidised to carboxylic acid).

\[\begin{array}{cc}
\phantom{}\ce{CHO}\phantom{..................}\ce{COOH}\phantom{.}\\
\phantom{..}|\phantom{.......................}|\phantom{........}\\
\ce{(CHOH)4 + [O] ->[Br2/H2O] (CHOH)4}\\
\phantom{}|\phantom{.......................}|\phantom{......}\\
\phantom{..}\ce{\underset{Glucose}{CH2OH}}\phantom{...............}\ce{\underset{Gluconic acid}{CH2OH}}\phantom{}
\end{array}\]