3. Inspect the structures of the terpenes in each pair below. Describe, in a few words, how you would distinguish them by infrared spectroscopy alone. For each pair, cite one or two prominent structural features (functional groups) and the specific wavenumbers of the corresponding infrared bands. It may be helpful to consult the Infrared Absorption Correlation Tables. (4 pts) (a) carvone vs. citronellol (b) citral vs. geraniol (c) p-cymene vs. menthone (d) limonene vs. myrcene