fall99org1q2

fall99org1q2 - bond dissociation energy 11) CH 2 CH 3 CH 3...

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Fall 99: 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 tick here (1-10) are True or False. 1) Kinetics is the study of the energy changes during a reaction. 2) A molecule which is chiral MUST contain at least one chiral atom. 3) If weaker bonds are broken, and stronger bonds formed, then the reaction is endothermic. 4) The below reaction has an unfavorable entropy change. C 6 H 14 C 2 H 6 + C 4 H 8 5) The bond dissociation energy is the amount of energy required to break a bond homolytically. 6) This molecule is chiral. CO 2 H Br Br Cl F CO 2 H 7) This molecule is chiral. F F 8) These compounds are enantiomers. Cl Br CH 3 F F Cl CH 3 Br Fall99-org1quiz2 Page1
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9) S N 1 reactions always proceed with total retention of stereochemistry. 10) E1 reactions involve carbocation intermediates. 11-13) Circle (or draw in) the C-H bond in each molecule that has the lowest
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Unformatted text preview: bond dissociation energy 11) CH 2 CH 3 CH 3 12) 3) 1 4) State the Hammond Postulate. 1 5) Give the two allowed geometries for an E2 elimination to occur. 1 Fall99-org1quiz2 Page2 16) Which conformation of bromocyclohexane (in its chair conformation) would undergo faster elimination of HBr. 17) Star (asterix, *) and assign the (R) or (S) configuration to any chiral centers in the below molecule. CH 3 Br H H Br CH 3 18) Is this compound the meso or (dl) diastereomer? 9) Is the compound in (17) chiral or achiral? 0) Is the below reaction an elimination or a substitution? * BON Give an everyday object (or objects) which can be described as meso . 1 2 K US QUESTION for 1 extra point * I + KBr CH 3 CHBrCHICH 3 CH 3 CHBrCHBrCH 3 Fall99-org1quiz2 Page3...
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fall99org1q2 - bond dissociation energy 11) CH 2 CH 3 CH 3...

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