The effect of the length and the type of the carbon chain of aliphatic aldehydes on their electrooxidation in sulphuric acid media on a bright Pt electrode was investigated. 0.01 M solutions of formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde and isobutyraldehyde in 0.5 M sulphuric acid were studied under conditions of triangular potential sweep control. Acetone and ethyl methyl ketone were comparatively electrooxidized. It is concluded that the mechanism of acetaldehyde electrooxidation proposed earlier by the authors can be extended over the homologous series of the aliphatic aldehydes.