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2004_Final_Exam

2004_Final_Exam - Final Examination CHM 231 Fall 2004 Dr...

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Final Examination CHM 231 Fall, 2004 Dr. Gust Time limit: 110 minutes NAME : ___________________________ Answer on these sheets Total points = 150 SIGNATURE : ____________________________ In the questions below, circle the letter corresponding to the correct answer. They are worth 2 points each. There is only one correct answer in each question. If more than one is circled, your grade for that question will be zero. 1. Which is the electronic configuration that describes the carbon atom? a. 1s 2 , 2s 2 b. 1s 2 , 2s 2 , 2p 6 , 3s 2 c. 1s 2 , 2s 2 , 2p 2 d. 1s 2 , 2s 2 , 2p 6 2. How many primary carbons are there in the following molecule? CH 2 CH 3 C CH 3 CH 2 CH 3 H 3 C a. 1 b. 2 c. 4 3. A Grignard reagent is prepared by reacting cyclopentanol with first thionyl chloride and then magnesium in ether. The Grignard reagent is then reacted with acetaldehyde (ethanal) and the reaction mixture acidified. What is the major final product of this series of reactions? CHCH 3 OH OH CH 2 CH 3 CH 2 CH 2 OH CH 2 OCH 3 1
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4. Which compounds are acetals? O CH 3 O OH O O CH 3 CH 3 O O O O CH 3 CH 3 O OCH 3 I II III IV V VI 5. Which characteristics are correct for a peptide bond in a polypeptide? I) planar II) cis III) trans IV) tetrahedral 6. Which of the following alkenes do not show cis-trans isomerism? I) 2-methyl-2-hexene II) 1-chloro-1-butene III) 1-methylcyclohexene IV) 2-methyl-3-hexene a) I, II b) III, IV c) II, III, IV d) I, III 2
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7. Which functional groups shown below have the correct Lewis structures? C O H C O C O O H hydroxyl carbonyl carboxyl I II III 8. Which is the major product from the reaction of cyclopentene with Br 2 ? Br H H Br Br H H Br H Br Br Br 9. Which of the following are constitutional isomers of trans-1,2-dimethylcyclopentane? I II III IV V 10. Which conformer of pentane is least stable? CH 2 CH 3 H H CH 3 H H CH 3 CH 2 H H CH 3 H H CH 3 CH 2 H H H CH 3 H CH 2 CH 3 H H H H CH 3 a. b. c. d. 3
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11. Which statements about mRNA codons are correct? I) Each amino acid is coded by only one codon. II) A given codon codes for several different amino acids. III) UAA, UAG, UGA are stop codons. IV) Several amino acids are coded by more than one codon. 12. Which sugars and classifications are correctly matched? CH 2 OH OH H OH H H OH CHO CH 2 OH HO H OH H H HO H OH CHO CH 2 OH H HO OH H CHO CH 2 OH HO H OH H H HO O CH 2 OH CH 2 OH OH H OH H O CH 2 OH aldohexose I aldotetrose II aldohexose III ketotetrose IV ketopentose V
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