Question Detail

CHM 102 Carbonyl Compounds Objective Question

Question

What is the positive result of Fehling's test for an aldehyde?
Options
A Silver mirror
B Yellow precipitate
C Red/brown precipitate of Cu₂O
Correct Answer
D White precipitate
Correct Answer

Option C is the correct answer.

Detailed Explanation

Fehling's solution contains Cu²⁺ (blue) which is reduced by aldehydes to red/brown copper(I) oxide (Cu₂O) precipitate. Ketones do not react.

Hint

Copper(I) oxide precipitate.

Question Info