+2 +3 +2 +4 +2 +3

Acetaldehyde, ethanal, is oxidised to acetate ion (ethanoate) by diamminosilver(II) ion, a constituent of Tollens' reagent.

This reagent is used to distinguish between aldehydes and ketones, and between "reducing sugars" and "non-reducing sugars".

Reaction defined as:
British A-Level Chemistry: A2
Functional Group Interconvertion
Oxidation: Of Substrate By Reagent
Redox