Question

Statement I: Glucose gives a reddish-brown precipitate with Fehling's solution.
Statement I: Reaction of glucose with Fehling's solution gives CuO and gluconic acid.
(IIT-JEE, 2007)

• A. Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.
• B. Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.
• C. Statement I is true; Statement II is false
• D. Statement I is false; Statement II is true

Answer 1

The correct option is C Statement I is true; Statement II is false

Statement I is true but Statement II is false because $C{u}^{2+}$ of Fehling's solution, $\left[Cu\right(N{H}_3{)}_4{]}^{2+}(OH{)}_2,$ is reduced $C{u}^{+}$ to give a red precpitate of $C{u}_{2}O.$
$OCH(CHOH{)}_{4}C{H}_{2}OH+C{u}^{2+}+\stackrel{\ominus }{O}H{\to }^{\ominus }OOC-(CHOH{)}_{4}C{H}_{2}OH\left(gluconicacid\right)+C{u}_{2}O+H_{2}O$