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Answer Key Only

Organic Chemistry 243-01

February 23, 2000

QUIZ THREE

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1. (15 pts)  Draw one gauche rotamer, the anti rotamer and the eclipsed 
             rotamer of 1,2-dichloroethane.



 ANSWER 
 
                                                        
2. (5 pts;) Briefly explain why the eclipsed (highest energy) rotamer of butane 
            [C1H3C2H2C3H2C4H3] using the C2-C3 bond is about the same 
            energy as the eclipsed rotamer of pentane  [C1H3C2H2C3H2C4H2C5H3]
            using the C2-C3 bond, although the latter has a methyl-ethyl
            interaction and the former a methyl-methyl interaction.

 ANSWER 
 
                                                        
3. (5 pts)  Briefly discuss why cyclobutane exists primarily in an angular 
             conformation rather than planar.

 ANSWER 
 
                                                        


For more information, contact Professor Michael B. Smith at

(860)-486-2881.

                                                                           
                                                                                
My EMail address is                                                             

smith@nucleus.chem.uconn.edu

Thank you very much.