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CHEM 121 W09 Test 1 Name: __________________________ Date: _____________ 1. Which of the following could not be the molecular formula for an alkane molecule? A) C4H10 B) C5H14 C) CH4 D) C18H38 2. The representation A) a molecular formula B) a condensed structural formula C) an expanded structural formula D) a skeletal structural formula for the alkane pentane is an example of 3. Which of the following alkanes has the IUPAC name 2-methylbutane? A) B) C) D) 4. How many carbon atoms are present in the alkane whose IUPAC name is 2,3,3-trimethylpentane? A) five B) seven C) eight D) nine Page 1 5. When the molecular formulas for cyclic and noncyclic alkanes with the same number of carbon atoms are compared, it is always found that the cycloalkane has A) two more hydrogen atoms. B) the same number of hydrogen atoms. C) two less hydrogen atoms. D) four less hydrogen atoms. 6. The most important chemical use for alkanes relates to their chemical reaction with A) hydrogen. B) oxygen. C) chlorine. D) bromine. 7. Which of the following is a correct structural formula for an alkane? A) B) C) D) more than one correct response E) no correct response 8. In which of the following alkanes are 13 covalent bonds present? A) B) C) D) more than one correct response E) no correct response Page 2 9. Which of the following alkane structures contain both secondary and tertiary carbon atoms? A) B) C) D) more than one correct response E) no correct response 10. For which of the following halogenated cycloalkanes is cis-trans isomerism possible? A) 1,1-dichlorocyclobutane B) 1-bromo-1-chlorocyclobutane C) 1-bromo-2-chlorocyclobutane D) more than one correct response E) no correct response 11. The correct IUPAC name for CH3 CH CH CH CH3 CH3 is A) B) C) D) 12. 2-methylpentene. 2-methyl-3,4-pentene. 2-methyl-3-pentene. 4-methyl-2-pentene. The correct IUPAC name for A) 1-methyl-2-cyclopropene B) 2-methyl-1-cyclopropene C) 3-methylcyclopropene D) 1-methylcyclopropene is Page 3 13. Cis-trans isomerism is possible for which of the following alkenes? A) CH2=CH–CH2–CH2–CH3 B) CH3–CH=CH–CH2–CH3 C) CH3–CH=CH2 D) CH2=CH–CH2–CH3 14. Markovnikov's rule is needed to predict the product in the reaction between HCl and A) CH2=CH2. B) CH3–CH=CH–CH3. C) CH2=CH–CH3. D) CH3–CH3. 15. The IUPAC name for the hydrocarbon CH3 CH2 CH2 CH CH2 CH3 A) B) C) D) 3-benzylhexane. 4-benzylhexane. 3-phenylhexane. 4-phenylhexane. 16. Which of the following is a correct IUPAC name for a substituted cycloalkene? A) 1-methyl-2-cyclopentene B) 2-methyl-1-cyclopentene C) 2-methylcyclopentene D) more than one correct response E) no correct response 17. Markovnikov's rule is needed to predict the organic product in which of the following reactions? A) 2-butene + HCl B) 1-butene + H2 (Ni catalyst) C) cyclobutene + H2O (H2SO4 catalyst) D) more than one correct response E) no correct response Page 4 18. Which of the following is an incorrect IUPAC name for a disubstituted benzene? A) 2,3-dichlorobenzene B) 1-bromo-4-chlorobenzene C) 1-bromo-3-methylbenzene D) more than one correct response E) no correct response 19. Which of the following reactions involving benzene require the presence of an AlCl3 catalyst? A) alkylation B) bromination C) chlorination D) more than one correct response E) no correct response 20. A general method for preparing alcohols is the A) hydration of alkenes. B) combustion of alkanes. C) combustion of ethers. D) hydrogenation of alkenes. 21. Which of the following is a secondary alcohol? A) B) C) D) 22. Intramolecular dehydration of an alcohol produces a(n) A) alkane. B) alkene. C) ether. D) thiol. Page 5 23. All of the following general formulas except one represent an ether. The exception is A) R-O-R B) Ar-O-R C) H-O-Ar D) Ar-O-Ar 24. The solubility of alcohols in water A) decreases as the carbon chain length increases. B) decreases as the number of –OH groups present increases. C) increases with increasing molecular mass. D) more than one correct response E) no correct response 25. In a secondary alcohol, the hydroxyl-bearing carbon atom A) is always involved in a double bond. B) is attached to two other carbon atoms. C) cannot be bonded to hydrogen atoms. D) more than one correct response E) no correct response 26. In which of the following pairs of names do both names represent the same ether? A) diethyl ether and 1,2-diethoxyethane B) methyl isopropyl ether and 1-methoxypropane C) ethyl isopropyl ether and 2-ethoxypropane D) more than one correct response E) no correct response 27. Which of the following compounds is not a constitutional isomer of 1-butanol? A) diethyl ether B) 2-methyl-2-propanol C) 2-methoxypropane D) more than one correct response E) no correct response Page 6 Answer Key 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. B B A C C B E D B C D C B C C C E D A A C B C A B C E Page 7