This web site contains 64 structure elucidation problems for the qualitative analysis of organic compounds. For each problem the empirical formula, molecular weight, 500 MHz proton and 125 MHz carbon NMR spectra, IR and mass spectral data are presented. The problems are categorized as easy, moderate or difficult. Students in introductory Organic Chemistry who want practice identifying unknown compounds should find this site useful. Instructors looking for exam or classroom problems for students at this level could also take advantage of the information on this site.