Which of the following correctly lists the conformations of cis-1,4-di-t-butylcylcohexane in order of increasing energy?
A) chair

Question

Which of the following correctly lists the conformations of cis-1,4-di-t-butylcylcohexane in order of increasing energy?
A) chair < boat < twist boat < half-chair
B) twist boat < boat < chair < half-chair
C) chair < twist boat < half-chair < boat
D) boat < chair < twisted boat < half-chair
E) half-chair < chair < boat < twisted boat

Quizplus · Accepted Answer

In general, the order of increasing energy for conformations of cyclohexane is half-chair < chair < twist boat < boat. However, when bulky substituents like t-butyl groups are present, the energy order changes slightly. The twist boat conformation becomes more stable than the boat, but less stable than the chair. Therefore, the correct order of increasing energy for cis-1,4-di-t-butylcylcohexane is twist boat < boat < chair < half-chair. Choice B correctly lists the conformations in this order.

Which of the Following Correctly Lists the Conformations of Cis-1,4-Di-T-Butylcylcohexane