Question

Glucose on oxidation with bromine water yields gluconic acid. This reaction confirms the presence of ______.

Options

• six carbon atoms linked in straight chain

• secondary alcoholic group in glucose 

• aldehyde group in glucose 

• primary alcoholic group in glucose

Answer 1

Glucose on oxidation with bromine water yields gluconic acid. This reaction confirms the presence of aldehyde group in glucose.

Explanation:

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