Tollen's reagent, also known as silver mirror reagent, is used to test for the presence of aldehydes. Aldehydes can be oxidized to carboxylic acids by Tollen's reagent, and during this reaction, silver ions in the reagent are reduced to form a silver mirror on the inner surface of the reaction container.
Out of the options provided:
(a) CH3COOH (acetic acid) is a carboxylic acid and not an aldehyde, so it does not give a silver mirror with Tollen's reagent.
(b) CH3COCH3 (acetone) is not an aldehyde, so it does not give a silver mirror with Tollen's reagent.
(c) CH3COCI (methyl chloroformate) is not an aldehyde, so it does not give a silver mirror with Tollen's reagent.
(d) CH3CHO (acetaldehyde) is an aldehyde and can give a silver mirror with Tollen's reagent.
So, the correct answer is (d) CH3CHO.
