Question

Use the model kits to build each of the structures described in the following exercises. For your lab report, make a drawing of each structure in your laboratory notebook, and answer any questions pertaining to structures.

1-Construct molecular models of cis-1,2-dibromocyclopropane and its mirror image. Are they identical? How would you classify their relationship?

2-Construct molecular models of cis-1,2-dicholorcyclohexane and its mirror image. Are they able to superimpose upon each other? Rotate one of the models to the alternate chair form. Now can they be superimposed? What type of relationship is present in this case?

3-6. Construct a molecular model of 2-bromobutane. Now construct a second model that is the mirror image of the original one. Are they identical? Orient the model so that the hydrogen on the bromine-bearing carbon is pointing away from you and the other three atoms or groups bonded to the carbon bearing the bromine form a triangle facing you. Use the Cahn-Ingold- Prelog conversion to assign priories to these three substituents. In going from highest to second highest priority, notice whether a clockwise or counterclockwise direction is followed. If the direction is clockwise, the model represents the R stereoisomer, and if it is counter-clockwise, the model represents the S stereoisomer. The full name of the specific stereoisomer you have needs the R or S designation before the name 2-bromobutane. Now assign the configuration of the second model you built. It should have the opposite designation from the first one. Pair of stereoisomers, which are mirror images of each other, are enantiomers.

Answer 1