Ch310M-Ex3_KEY[1] - CH 310/318M - EXAM 3 Williams Fall 2010...

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CH 310/318M - EXAM 3 Williams Fall 2010 (MWF 12:00 1:00 PM) EID:__________________ 1 Name (print): ____________________________________________________________ Signature: _______________________________________________________________ Do Section I (Scantron) in #2 Pencil! Do Section II in blue or black PEN! Bubble the answers into your Scantron in advance you will NOT have time once the exam is over to do so! GOOD LUCK!! Please write the first three letters of your last name in the boxes
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CH 310/318M - EXAM 3 Williams Fall 2010 (MWF 12:00 1:00 PM) EID:__________________ 2 Question Value Score 1 30 2 10 3 17 4 22 5 16 6 18 7 12 Section II 125 Section I 125 Raw Total 250
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CH 310/318M - EXAM 3 Williams Fall 2010 (MWF 12:00 1:00 PM) EID:__________________ 3 PART 1 MULTIPLE CHOICE (5 PTS EA: 125 PTS in this section) 1) What is the best choice of reagent(s) to perform the following transformation? C C H 3 C H C H 3 C C H H H Br Br ? a. H 2 O; H 2 SO 4 b. 1) 2 moles of NaNH 2 ; 2) H 3 O + c. 1) 3 moles of NaNH 2 ; 2) H 3 O + d. tBuOK 2) Which of the following statements is not true regarding the halogenation of alkanes upon treatment with halogen and light? a. bromination is more selective for 3° positions than chlorination b. the reaction proceeds via a radical intermediate c. the reaction proceeds via a chain reaction d. this is a useful process for the formation of fluorides, chlorides, bromides and iodides 3) What is the characteristic of a radical chain propagation step? a. radicals are formed b. byproducts are formed c. a radical reacts with a molecule to give a new radical and a new molecule d. two radicals combine to give a molecule 4) Which of the following is most likely to undergo rearrangement during reaction with methanol? 1 2 3 4 Br Br Br Br a. 1 b. 2
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CH 310/318M - EXAM 3 Williams Fall 2010 (MWF 12:00 1:00 PM) EID:__________________ 4 c. 3 d. 4 5) W hich of the following is an accurate statement of Hammond’s postulate? a. the transition state of an exothermic reaction will resemble the starting materials (reactants) more than the product b. the transition state of an exothermic reaction will resemble the products more than the starting materials (reactants) c. the transition state of an endothermic reaction will resemble the starting materials (reactants) more than the product d. the difference in energy between the starting materials (reactants) and transition state controls the rate of a reaction
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Ch310M-Ex3_KEY[1] - CH 310/318M - EXAM 3 Williams Fall 2010...

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