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The 5 pages that link to Oxidation of aldehydes, each with the reason it gives.
AldehydeBroader topic: Aldehydes oxidize readily because the carbonyl carbon retains a hydrogen.
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.