The infrared spectra for three compounds are provided. Each compound has one or more of the following functional groups: conjugated ketone, ester, amide, nitrile, and alkyne. Determine the functional group(s) in each compound, and assign the major peaks above 1600 cm-1?

wavelength (um) 2.5 100 3.5 4 45 5 5.5678 9 10 12 13 14 15 16 20 1685 0 3500 2500 2000 1800 1600 1400 1200 1000 800 600 wavenumber (cm1) wavelength (um) 2.5 100 4 4.5 10 12 14 15 16 80 20 1738 3500 3000 2500 2000 1800 1600 1400 1200 1000 800 600 wavenumber (cm wavelength (m) 2.5 100 3.5 4 4.5 5 5.5 6 7 8 9 1012 13 14 15 16 3 3500 3000 2500 800 2000 1800 1600 1400 1200 1000 wavenumber(cm)