Question

Which is the product obtained, when Br₂ water reacts with glucose?

Options

• 1,6-dlbromo glucose

• Saccharic acid

• Gluconic acid

• Bromohexane

Answer 1

Gluconic acid

Explanation:

When Br₂ water interacts with glucose, gluconic acid is formed.

\[\begin{array}{cc}
\ce{CHO}\phantom{.............}\ce{COOH}\phantom{..}\\
|\phantom{..................}|\phantom{.......}\\
\ce{(CHOH)4 ->[Br2 water][oxidation] (CHOH)4}\\
|\phantom{..................}|\phantom{.......}\\
\phantom{....}\ce{\underset{\text{D-glucose}}{CH2OH}}\phantom{.........}\ce{\underset{\text{Gluconic acid}}{CH2OH}}
\end{array}\]

Glucose is oxidised to a six-carbon carboxylic acid when it reacts with Br₂ water. This suggests that the current carbonyl group is an aldehydic group.