Benzaldehyde 2,4-Dinitrophenylhydrazone is primarily used in analytical chemistry as a reagent for the identification and quantification of carbonyl compounds, particularly aldehydes and ketones. It forms brightly colored derivatives when reacted with these compounds, making it useful for qualitative analysis through visual inspection or spectrophotometric methods. The compound is also employed in chromatography as a derivatizing agent to enhance the detection of carbonyl-containing substances in complex mixtures. Additionally, it finds application in research laboratories for studying reaction mechanisms involving carbonyl groups, as well as in quality control processes to ensure the purity of aldehydes and ketones in industrial products.