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Unformatted text preview: 1 Exam 2 Practice Exam B 1. In each of the following pairs of carboxylic acids, circle the one that would have a lower pK a value and briefly explain your choice for each. (4 pts each; 16 pts total) F OH O (a) Br OH O (b) N OH O or HO OH O or (c) F O OH O OH F or (d) O HO O OH or OH O Put explanations in the boxes. Periodic table it may be helpful for this problem. 2 2 . Looking at a reversible reaction. (a) Draw out the overall scheme of ( E )-pent-3-en-2-one reacting with ammonia to make 4-aminopentan-2-one. (4 pts) (b) Using information from the following table, determine if product formation will be favored by calculating H rxn . Show work for full credit! (8 pts) Bond Average Bond Dissociation Energy (kcal/mol) C-C 83 C-H 99 C-N 73 O-H 111 N-H 93 C=C 146 C=O 178 C=N 147 Show calculation in box. Whatever appears in the box will be graded. Will product formation be favored? Yes or No (circle your answer) 2 2 . Looking at a reversible reaction....
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This note was uploaded on 01/12/2012 for the course CHEM 2347621 taught by Professor Mr.boikes during the Summer '09 term at Rutgers.
- Summer '09