CHEM 241 Midterm: CHEM 241 UPenn Exam1 sec2 05Solutions
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1. (16 points) provide correct iupac names for the following compounds. bicyclo[3. 3. 0]octane. 1-ethyl-5-(1,1-dimethylpropyl)-2- methylcycloheptane: draw a correct structural representation for the following compound. 5-(1,2,2-trimethylpropyl)nonane (8 points) draw the simple molecular orbital diagram for the formation of the pi portion of a. Use an energy scale to show how the starting atomic orbitals combine to form the molecular orbital(s). Show how you can relate the bond energy of the pi bond to your diagram. 2 e= pi bond energy: (14 points) the following tri-substituted cyclohexane exists as a 1:1 mixture of two chair conformations at room temperature. Draw clear representations of these two chair conformations and label all of the axial and equatorial substituents. axial. Using this information predict the difference in energy between the two chair conformations of the mono-x substituted cyclohexane. Since 1:1 mixture (k=1), g=0, so the two chair forms of the tri- subsitututed cyclohexanes have the same energy.
