Question

Draw trans-1-ethyl-3-methylcyclohexane in its lowest energy conformation. Choose a chair from the Templates toolbar at the bottom. Make sure it’s the appropriate chair, including any heteroatoms. Replace the appropriate hydrogens with the appropriate −CH3 or other groups. Important: Never delete the hydrogen atoms or bonds in the ring or directly attached to the ring. Also, do not try to move them by drag and drop. These actions will break the chair conformation structures. Just replace them! If you are told your answer is incorrect, use the Undo button to go back, or start over by deleting the structure and re-adding the chair from the templates. You will not lose credit for responses that cannot be interpreted.

Answer 1

In most stable conformation, bulkier ethyl group must be present at equatorial position because in that case there is minimum repulsion. Trans isomer contain both groups pointing in opposite direction.

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