Consider the most stable chair form for cis-1,2-dimethylcyclohexane. Now, consider the most stable chair form for trans-1,2- dimethylcyclohexane. Which of the following is true? (Select only 1 option) O The trans isomer is more stable, since both of its substituents are axial in the preferred chair conformation. O The trans isomer is more stable, since both of its substituents are equatorial in the preferred chair conformation. O The cis isomer is more stable, since both of its substituents are axia| in the preferred chair conformation. O The cis isomer is more stable, since both of its substituents are equatorial in the preferred chair conformation.

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for the following substituted cyclohexane, draw both chair conformations. Using rules of cyclohexane substituent stability and known strain values, verify which is the more stable of the two HO H₂Nim b H

4. (a) Draw a skeletal (line-bond) structure for 3,4-dimethylhexane. (b) Draw a sawhorse representation of any staggered conformation of this molecule looking down the carbon-3 to carbon-4 bond. (c) Draw a Newman projection looking down the carbon-3 to carbon-4 bond of the same conformation that you drew as a sawhorse representation.

In the box below give the Newman projection of the most stable conformer of the molecule shown below looking at the C2-C3 bond (in red). Place C2 in front. On the side list the energy strains that exist in that conformation. 3 CH3

Given the structure of the following 1,2,3,5-tetrachlorocyclohexane: Draw the most stable chair conformation for the above 1,2,3,5-tetrachlorocyclohexane. Draw the least stable chair conformation for the above 1,2,3,5-tetrachlorocyclohexane

4. Draw a chair conformation of the following molecules. Ring flip your original chair, and circle the more stable conformation. cis-1,2-dimethylcyclohexane trans-1-tert-butyl-3-ethylcyclohexane cis-1,4-diisopropylcyclohexane cis-1-butyl-3-methylcyclohexane