Question

Fructose reduces fehling's solution due to the presence of:

• A. hydroxy group.
• B. aldehyde group.
• C. ketone group.
• D. $\alpha$-hydroxyketone group.

Answer 1

Answer: (D)

$\alpha$-hydroxyketone group.

In basic medium, fructose show keto-enol tautomerism and thus isomerises to glucose due to which it gives positive Tollen's and Fehling's reagent test.