Tollens' reagent is an alkaline solution of ammoniacal silver nitrate and is used to test for aldehydes. Silver ions in the presence of hydroxide ions come out of solution as a brown precipitate of silver(I) oxide, Ag2O(s). This precipitate dissolves in aqueous ammonia, forming the diamminesilver(I) ion, [Ag(NH3)2]+.
What happens to aldehyde in tollens test?
Silver mirror. ... Hint: Tollens test or silver mirror test uses tollens reagent and it is basically oxidation of aldehyde group to its corresponding acid. - Tollens reagent is a solution of silver nitrate and ammonia. - Acetaldehyde when reacted with tollens test it gets oxidized to acetic acid.
Do aldehydes give positive tollens test?
The structure contains aldehyde that gives positive tollen's test. Hence this option is correct. The aldehyde group is attached to a benzene ring. This reagent gives a positive test for aromatic aldehyde also.
