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Unformatted text preview: name ______________________________ Page 1 of 6 Multiple Choice. Choose the best answer for the following questions. (10 questions, 40 pts) 1. What atomic orbitals are involved in making a C-H bond in methane? a) a 2p orbital on C and a 1s orbital on H b) a 2s orbital on C and a 1s orbital on H c) an sp3 orbital on C and a 1s orbital on H d) an sp2 orbital on C and a 1s orbital on H 2. The bond angles A and B for the molecule below are: O A B a) A= 120, B= 120 b) A= 120, B= 109 c) A= 109, B= 109 d) A= 109, B= 120 3. Ozone has the molecular formula of O 3 . Which of the following is NOT a proper Lewis structure of O 3 . O O O O O O _ a) b) c) d) O O O _ + a, b, and c are all proper Lewis structures 4. The barrier to rotation about the C-C bond of bromoethane is 15 KJ/mol. What energy value can be assigned to an H-Br eclipsing interaction? a) 15 KJ/mol b) 4 KJ/ mol c) 7 KJ/mol d) The energy value cannot be determined with the information given. 5. Which of the following is the most stable conformation of 1-bromopropane? Br H H CH 3 H H H H H Br H H H Br H CH 3 H H H H H CH 3 Br H a) b) c) d) name ______________________________ Page 2 of 6 6. Ethoxide ion (CH 3 CH 2 O- ) is a useful base in organic chemistry. The pKa of ethanol is 16. Which of the following bases can be used to generate ethoxide ion from ethanol? (ignore the counter ion) a)- CN (HCN, pKa = 9.3) b) CH 3 CO 2- (CH 3 CO 2 H, pKa = 4.7) c)- NH 2 (NH 3 , pKa = 35)...
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- Fall '08
- Atomic Orbitals