Problems 285 23. The NMR spectra are shown in parts a, b, c, and d for four isomeric compounds with formula CioH12O2. Their infrared spectra show strong bands near 1735 cm, Make no attempt to inter- pret the aromatic proton area between 7.0 and 7.5 ppm except to determine the number of pro- tons attached to the aromatic ring. Draw the structures of the compounds. CioH1202 4.84 7.5 7.0 2.06 2.05 3.01 55 5.0 4.5 4.0 3.5 30 25 20 LS (a) Ci0H1202 317 4.94 70 2.08 2.04 3.13 23 3.0 35

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.