CHE128C Quiz 1 S09 Key Chen

CHE128C Quiz 1 S09 Key Chen - following diene(4 pts Br 2 Br...

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CHE128C Organic Chemistry Spring 2009 Quiz 1 April. 13, 2009 Name_____________________________________________________ Last, First Middle Score____________________________________/25 pts 1. Multiple choices. Circle the best answer (12 pts total, 3 pts each). i) Which of the following is the strongest acid? OH OH OCH 3 OH CF 3 OH NO 2 1 2 3 4 ii) Which of the following dienes releases the most energy during exothermic hydrogenation by treating it with H 2 /Pd? 1 2 3 4 iii) Which of the following compounds is not aromatic? N S N H N 1 2 3 4 iv) Which of the following electronic transitions is apparent in the ultraviolet-visible spectrum of 1,3-butadiene? a) n π * b) π π * c) σ → π * d) σ → π Page 1 of 2
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CHE128C Organic Chemistry Spring 2009 Quiz 1 2. Write out the thermodynamic product obtained from the addition of 1 mole of bromine to the
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Unformatted text preview: following diene (4 pts). Br 2 Br Br 3. Name the following compounds (4 pts total, 2pts each). Cl Br O 2 N OH 4-bromo-3-chlorotoluene 3-nitrophenol 4. The weight of proteins or nucleic acids in solution is commonly determined by UV spectroscopy using the Beer-Lambert law. For example, the ε of double-stranded DNA at 260 nm is 6670 M-1 cm-1 . The formula weight of the repeating unit in DNA (650 grams/mol) can be used as the molecular weight. What is the amount (mg) of DNA in 2.0 ml of aqueous buffer if the absorbance, measured in a 1 cm cuvette, is 0.75? (5 pts) A= ε Cl C=0.75/(6670*1) C=1.124*10-4 M Amount of DNA=1.124*10-4 *650*(2*10-3 ) =0.146mg Page 2 of 2...
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CHE128C Quiz 1 S09 Key Chen - following diene(4 pts Br 2 Br...

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