Thanks for posting this!
This may sound stupid but I don't understand this:
4. The most stable conformational isomer of trans-1-ethyl-2-methylcyclohexane will be...I don't understand how C is trans...
As sad as it may sound, I seriously don't remember learning that in Ochem. Thanks, that made perfect sense!when looking at these you determine cis or trans by whether the methyl and ethyl are up or down, not both axial or both equitorial. So for C, Ethyl is equitorial and the H is axial, and the Et is obviously below the H..On the other hand even though Me is also equitorial and the H is axial, this time the equitorial position is above the axial (ME is above H). This makes it trans. For cis the Me and Et would have to be either both up or both down. Hope that clarifies alittle