Some carboxylic acid herbicides and related compounds such as - p-chlorophenoxyacetic acid, benzoic acid, cinnamic acid. beta -naphthoxy acetic acid, alpha -naphthoxy acetic acid. beta -naphthalene acetic acid, indole 3-acetic acid. indole propionic ac id and gallic acid have been separated on silica gel G-barium sulphate coatings in different ratio using acetone as mobile phase. The ion pair thin layer chromatography (IPTLC) has shown the better possibilities of separating ternary mixtures of a herbicides and related compounds in comparison to the normal phase TLC.