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Lab Technique and Spectroscopy 161 364. The free radical monochlorination of 2-methylbutane will give the following products: Cl Cl Cl Cl Which of the following methods would be the best at identifying the different products? (A) 1H NMR spectroscopy (B) IR spectroscopy (C) Mass spectroscopy (D) UV-Vis spectroscopy 365. How many 1H NMR resonances appear in the aromatic region of the following ion? + (A) 0 (B) 3 (C) 5 (D) 4