Write a balanced chemical equation for the reaction that is described and then classify the reaction as a substitution, an elimination, an addition, or a rearrangement reaction:

(a) Ethene and Br₂ react in carbon tetrachloride to give 1,2-dibromoethane.

(b) Iodoethane reacts with KOH(aq) yielding ethene, water, and potassium bromide.

(c) Chloromethane reacts with NaOH(aq) to give methanol and sodium chloride.