Consider the following two stereoisomers of 1-bromo-3- tert -butyl-5-methylcyclohexane: 1 : 2 : Choose the correct statement(s) concerning their reaction rates: I. 1 will undergo S _ N 1 reactions faster than 2 . II. 1 will undergo E1 reactions faster than 2 . III. 1 and 2 will undergo S _ N 1 reactions at the same rate.

Step-by-step solution

The rate of S _ N 1 and E 1 reactions depends on the rate-determining step, which is the formation of a carbocation intermediate via the departure of the leaving group ( Br ⁻ ). The reaction rate is higher if the ground state of the reactant is less stable (higher in energy) due to steric strain that is relieved upon ionization, a phenomenon known as steric acceleration. First, let's determine the most stable chair conformation for both isomers. The bulky tert -butyl group will lock the cyclohexane ring in a confor