Draw the structure of the major form of each of the following compounds present in an aqueous solution containing initially one molar equivalent of 1 M HCl. Explain your reasoning.

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(a) quinine (Fig. 23.4, p. 1222) (b) nicotine (Eq. 26.26, p. 1339 or Fig. 23.4, p. 1222) (c) CH,CH,NH, (d) (e) H tryptamine 3,4-diaminopyridine H N 1,4-diazaindene N (g) See Fig. P26.33. CH3 1-methyl-1,2,3-benzotriazole