sum05 final key

sum05 final key - CHEMISTRY 30B UCLA SUMMER SESSION C 2005...

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CHEMISTRY 30B UCLA SUMMER SESSION C 2005 FINAL EXAM On my honor, I have neither given nor received any aid on this exam. KEY ____________________________ __________________________ S i g n a t u r e I . D . N u m b e r KEY _____________________________ N a m e ( P r i n t ) Question Points -------------------------------------------------- 1 (37) -------------------------------------------------- 2 (10) -------------------------------------------------- 3 (10) -------------------------------------------------- 4 (10) -------------------------------------------------- 5 (18) -------------------------------------------------- 6 (18) -------------------------------------------------- 7 (24) -------------------------------------------------- 8 (24) -------------------------------------------------- 9 (34) -------------------------------------------------- 10 (15) -------------------------------------------------- Total (200)
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Chemistry 30B FINAL, Summer 2005 Name: KEY Page 2 THEORY 1. A. (5) Rank (1 most, 5 least) the following cations for stability. 4 3 2 5 1 OMe OMe OMe N H B. (10) What are the approximate pKa’s of the following compounds? Ammonia 36 Acetic acid 5 Acetone 20 NH of Acetamide 16 Butane 50 Ethanol 16 Ethyl Acetate 24 2,4-pentanedione 10 Propyne 25 Triethylammonium 10 C. (5) Rank (1 most, 5 least) the following for reactivity with methyl magnesium bromide. 4 3 5 1 2 O O O CF 3 O N O Cl O O O O C. (5) Explain (words and drawings) the acidity of acetone verses 2,4-pentanedione. O O O Base Base O O O O O O O O There is more resonance delocalization (stabilization) for the dione anion, so the dione is more acidic. pKa 10 vs pKa 20. E. (12)
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sum05 final key - CHEMISTRY 30B UCLA SUMMER SESSION C 2005...

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