fall07org1q2 - G = S H T Fall07org1q2 Page1 11-14) Circle...

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Fall 07: Quiz 2 Ch 4-6 20points N a m e If you do not want your graded quiz placed in the box outside my office, then please check here (1-10) are True or False. 1) The mirror image of a chiral molecule is nonsuperimposable upon the original molecule. 2) Thermodynamics is related to energy changes which is related to the position of equilibrium (K) for a particular chemical reaction. 3) A mixture containing equal amounts of R and S enantiomers is called a cimecar mixture . 4) A favorable entropy change results from an increase in disorder. 5) The lower the bond dissociation energy of a bond, the easier it is to break. 6) The initiation step of a free radical chain process involves the creation of reactive radical species. 7) The E2 reaction gives products of substitution with 100% inversion of stereochemistry. 8) This molecule has four chiral centers. CHO OH H OH H OH H OH H CH 2 OH 9) S N 1 reactions always proceed with total retention of stereochemistry. 10) Gibbs free energy change,
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Unformatted text preview: G = S H T Fall07org1q2 Page1 11-14) Circle the more stable species in each threesome. 11) 12) 13) 14) 15) Two of these four compounds will ionize with loss of Bromide ion to form the same carbocation. Circle those two compounds. Br Br Br Br 16) For an S N 1 reaction, if the concentration of substrate was doubled, and the concentration of the nucleophile was doubled, how much would the reaction rate increase ? 17) What is the Hammond Postulate ? Fall07org1q2 Page2 18-19) How many of these dichlorocyclopropanes are chiral ? How many of these dichlorocyclopropanes are meso ? Cl Cl Cl H H Cl H Cl H Cl H Cl H Cl 20) Are these two compounds related as being enantiomers, same or diastereomers ? H H CH 3 OH CH 2 Br HOCH 2 OH H CH 2 Br H 3 C CH 2 OH H * BONUS QUESTION for 1 extra point * What are the advantages of knowing and understanding the mechanism by which a particular reaction proceeds ? Fall07org1q2 Page3...
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fall07org1q2 - G = S H T Fall07org1q2 Page1 11-14) Circle...

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