Question

This question concerns the cis and trans isomers of 1-ethyl-4-11-methylethylcyclohexane. The question consists of three parts. Each part is graded independently and worth 0.2875 pts Part 1. Out of the following structures, lease enter the single character that identifie ur choice represents the most stable conformation of cis-1-ethyl-4-(1-methylethyl cyclohexane. A. B. C. D. X E. F. G. H. 1. K. M. N. 0. P.

Answer 1

1. L - Represent the most stable structre of Cis-1-ethyl-4-(1-methylethyl)cyclohexane because bulky group present at 4th position is equitorial which causes less repulsion because of cis both group is in the same direction that is below the plane.

2 HO BH H H cis-isomer L. и Н H H С C steric Repulsion OS H H H 2 K. trans-isomey CH3 » 24 Hz H H H 4 H no steuc Repulsion

2. K - Represent the most stable structure of trans-1-ethyl-4-(1-methylethyl)cyclohexane because both the group is at equitorial position which causes less repulsion hence the less energy.

3. b. trans is more stable then cis isomer because in case of trans both group are at equitorial where they are causes minimum repulsion and in case of cis isomer one group is at equitorial and one is at axial causes more repulsion hence more energy and less stable.