Which of the following account(s) for the fact that reactions between ions in solution are usually very fast?

Question

ionic bonds are weak
no covalent bonds need to be broken for reaction to occur
reactions between ions are endothermic
reactions between ions are exothermic

Answer 1

No covalent bonds need be broken. In fact, covalent bonds are usually formed, as in the liberation of CO2 or the formation of H2O.