Question

From the compounds given below, the number of compounds which give a positive Fehling’s test is____.
Compounds: Benzaldehyde, Acetaldehyde, Acetone, Acetophenone, Methanal, 4-nitrobenzaldehyde, cyclohexane carbaldehyde.

Answer 1

Correct Answer: 3

Fehling’s test is positive for compounds with an aldehyde group (except for aromatic aldehydes) or alpha-hydroxy ketones.

The compounds that give a positive Fehling’s test are:

• Acetaldehyde (CH₃CHO)
• Methanal (HCHO)
• Cyclohexane carbaldehyde

Other compounds, such as benzaldehyde, acetophenone, and 4-nitrobenzaldehyde, do not give a positive Fehling’s test because they are aromatic aldehydes or ketones.

Thus, the correct count is:

So, the correct answer is: 3