Exercise 4.2.14.2.1\PageIndex{1} Draw electron movement arrows to illustrate mechanism of the acid-base reaction between acetic acid, CH3CO2HCH3CO2H\ce{CH3CO2H}, and ammonia, NH3NH3\ce{NH3}. Draw out the Lewis structures of reactants and products, including all lone pairs and formal charges. Include a transition state drawing in your mechanism. Exercise 4.2.24.2.2\PageIndex{2} Draw electron movement arrows to illustrate the mechanism of the reverse of the reaction in Exercise 4.2.14.2.1\PageIndex{1}: the acid-base reaction between acetate ion (CH3CO−2CH3CO2−\ce{CH_3CO_2^-}, acting as a base) and ammonium (NH+4NH4+\ce{NH_4^+}), acting as an acid). Again, draw out the Lewis structures of reactants and products, including all lone pairs and formal charges.

4.2: A First Look at Some Organic Reaction Mechanisms