Question

Acetaldehyde on warming with Fehling's solution gives a red precipitate of

• A. Elemental copper
• B. Cuprous oxide
• C. Cupric oxide
• D. Mixture of all of the above

Answer 1

The correct option is B Cuprous oxide

Aliphatic aldehyde on warming with Fehling solution gives a red precipitate of cuprous oxide.
The reaction is as follow:

Benzaldehyde and ketones give negative Fehling's test.

Hence, the correct answer is option (b).