Conditions that favor an SN1 reaction mechanism also favor a(n) mechanism. As a result, both reactions usually take place at the same time to afford a of products.

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride