Aldehyde Appearance m-Tolualdehyde Pale yellow leaflets p-Tolualdehyde Pale yellow leaflets o-Chlorobenzaldehyde Yellow leaflets 2-Chloro-5-nitrobenzaldehyde Bright yellow needles condensed with o-aminophenol. Senier and Clarke4 carried out the same reaction with o-nitrobenzaldehyde, obtaining the condensation product. Levi'studied the same reaction and arrived at a similar conclusion. While differences in melting points were ...