Linked from
The 5 pages that link to Oxidation of aldehydes, each with the reason it gives.
CinnamaldehydeRelated: Oxidizing cinnamaldehyde converts its aldehyde group into cinnamic acid.
BenzaldehydeRelated: Oxidation turns benzaldehyde into benzoic acid.
ButyraldehydeRelated: Oxidation converts butyraldehyde into butanoic acid.
PropionaldehydeRelated: Oxidation converts propionaldehyde into propionic acid.