exam1 - First Three Letters of Last Name: TA Name: Hour...

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First Three Letters of Last Name: TA Name: Hour Exam #1 5.12 Spring 2005 Organic Chemistry I Printed name_______________________________________________________ Signature__________________________________________________________ ID#______________________________________________________________ Pre-requisite (circle one): 5.112 5.111 3.091 1. Make sure your exam has 9 numbered pages plus a periodic table. 2. Write your initials on each page. 3. Look over the entire exam before you begin to familiarize yourself with its length. Do what you know first, then attempt the harder problems. 4. Read the instructions carefully and budget your time. 5. Show all of your work. Partial credit receives points! Page Possible Points Total 1 6 2 16 3 10 4 10 5 16 6 12 7 12 8 18 Total 100 9 4 XC 104
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1. (1 pt) What is the pKa of a sp hybrdized carbon atom? a) 25 b) 35 c) 45 d) 50 2. (2 pts) a) Circle the letter of the molecule with the lowest barrier to rotation (or ring- flip). b) Box the letter of the molelcule with the highest barrier to rotation (or ring-flip). a) ethane b) propane c) butane d) cyclohexane 3. (2 pts) Rank the following substituents in order of priority (1 = highest priority). ____ -CH=CH 2 ____ -CN ____ -CH 2 NH 2 ____ -CH 2 Br 4. (1 pt) If a chiral molecule has an absolute configuration of R, which direction does it rotate the plane of polarized light?
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exam1 - First Three Letters of Last Name: TA Name: Hour...

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