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exam4 - First Three Letters of Last Name TA Name Exam 4...

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First Three Letters of Last Name TA Name Exam 4 5.12 Spring 2005 Name______________________________________ Signature___________________________________ ID#________________________________________ Prerequisite (circle one): 5.112 5.111 3.091 1. Make sure your exam has 11 numbered pages plus a periodic table. 2. Write your initials on each page. 3. Look over entire exam before starting and carefully read all instructions. 4. Show work for partial credit. Page Possible Points Total 1 10 2 12 3 15 4 12 5 9 6 12 7 10 8 10 9 10 Total 100 10 2 XC 102
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1. (10 points) a. Which compound is more susceptible to electrophilic aromatic substitution? 2 3 b. Which carbonyl compound is more susceptible to nucleophilic attack? O H O c. What is the purpose of the FeBr 3 catalyst in an electrophilic aromatic substitution halogenation? i. It serves as a radical initiator ii. It destabilizes the carbocation intermediate. iii. It acts as a Lewis acid to activate Br 2 . d. Rank in order of reactivity for electrophilic aromatic substitution (1= most reactive) Cl H N O O H 3 C e. Rank in order of acidity (1= most acidic).
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