a. Explain why both S_N2 and S_N1 reactions are not feasible for 1-(chloromethyl)-1-isopropylcyclohexane.
b. Are E2 and E1 reactions feasible for it?

• A. a. S_N1 and S_N2 reactions are not feasible due to the steric hindrance for the backside attack.b. E2 and E1 reactions are also not feasible.
• B. a. The S_N1 reaction is not feasible due to the formation of an unstable primary carbocation. The S_N2 reaction is not feasible due to the steric hindrance for the backside attack.b. E2 and E1 reactions are also not feasible.
• C. a. S_N1 and S_N2 reactions are not feasible due to the steric hindrance for the backside attack.b. E2 and E1 reactions are both feasible.
• D. a. The S_N1 reaction is not feasible due to the formation of an unstable primary carbocation. The S_N2 reaction is not feasible due to the steric hindrance for the backside attack.b. E2 and E1 reactions are both feasible.

Answer: (B)