1. (130 points). On the answer sheet provided, darken the space of the response
ID: 882492 • Letter: 1
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1. (130 points). On the answer sheet provided, darken the space of the response that best corresponds to the correct answer for each of the following questions. Note that questions 1-25 are worth 4 points apiece while questions 26-30 are each worth 6 points. 1. (4) An NMR absorption of 240 Hz on a spectrometer operating at 60 MHz would occur at_on a spectrometer operating at 300 MHz. a. 240 Hz b, 4.00 c. 80 Hz d.8125 2. (4) Two protons coupled by 6 Hz on a spectrometer operating at 100 MHz will be coupled by-Hz on a spectrometer operating at 300 MHz. a. 6 Hz b. 18 Hz c. 2 Hz d. it depends on the solvent and temperature of the experiment. 3. (4) Which of the following statements is NOT true about meso compounds? Meso compounds exhibit no optical activity. Meso compounds have an internal plane of symmetry. Meso compounds have a mirror image. Meso compounds have no chiral centers. a. b. c. 4. (4) Which of the following statements is true? a. A levorotatory compound has the S configuration b. The optical rotation of a racemic mixture is 0 c. The physical properties enantiomers are the same except for their specific rotation. d. Statements b and c are true. e. The physical properties enantiomers are the same except for their specific rotation 5. (4) When 1-methylcyclohexene is treated with HgOAc, the methyl and HgOAc groups in the product will be: a. cis and diequatorial b. cis and axial-equaorial c. trans and diequatorial d. trans and axial-equatorial 6. (4) The bond dissociation energy of a series of C-H bonds a. is a measure of the acidity of the hydrogen. b. provides an indication of the relative stabilities of the resulting radicals. c. is proportional to the amount of s character of the bonding hybrid orbitals. d. none of the above.Explanation / Answer
1)a
2) a
3) d
4) d
5) c
6) c
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