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- True or false? The NMR signal of an alcohol or amine proton often presents asa broad signal due in part to their exchangeable nature.The compound whose 1H NMR spectrum is shown has the molecular formula C3H6Br2. Propose a structure.Assign the peaks in the 1H NMR spectrum of eugenol (Fig. 6.23) to specific protons in the molecule. The OH peak is at 5.1 ppm.