Acetaldehyde and benzaldehyde can be differentiated by:A. Fehling’s testB. Iodoform testC. Tollens reagentD. Both ‘A’ and ‘B’

Acetaldehyde (ethanal) and benzaldehyde (benzenecarbaldehyde) can be differentiated using the following tests:

A. Fehling’s test: Acetaldehyde gives a positive Fehling's test, resulting in a red precipitate of copper(I) oxide. Benzaldehyde does not react with Fehling's solution.

B. Iodoform test: Acetaldehyde gives a positive iodoform test, forming a yellow precipitate of iodoform (CHI3), while benzaldehyde does not.

C. Tollens reagent: Both acetaldehyde and benzaldehyde give a positive Tollens' test, forming a silver mirror, so this test cannot be used to differentiate between them.

D. Both ‘A’ and ‘B’: This option is correct because both Fehling’s test and the iodoform test can differentiate between acetaldehyde and benzaldehyde.

Therefore, the correct answer is D. Both ‘A’ and ‘B’.