Quiz 4 Key

Quiz 4 Key - Answer D 3 Why is cyclohexane the most...

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1. How are isomers which differ only in their atomic arrangement in three-dimensional spaced designated? a. Constitutional isomers. b. Stereoisomers. c. Positional isomers. d. Cis isomers. Answer: B 2. Why is ring strain greatest in cyclopropane and cyclobutane, out of all the cycloalkanes? a. It isn’t; it is greatest in cyclobutane and cyclopentane. b. Because the bond angles in these two cycloalkanes are much larger than that which is the optimal angle for sp3 carbon. c. The angles in these two cycloalkanes exist but are energetically unstable and unfavorable. d. The bonds in these two cycloalkanes are less than the preferred 109.5 degree angle of sp3 carbon.
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Unformatted text preview: Answer: D 3. Why is cyclohexane the most strain-free of the cycloalkanes? a. Because the bond angles within the ring are very close to the optimum angles for sp3 hybridization. b. Because the ring size is correct. c. Because the right number of carbon atoms have equitorial and axial C-H bonds. d. Because there is little steric hindrance between C-H bonds. Answer: A 4. What is the most stable configuration of cyclohexane? a. Boat. b. Chair. c. Twist boat. d. Skew boat. Answer: B 5. What are the most stable, substituted cyclohexanes? a. Axially substituted. b. 1,3 - disubstituted. c. Equitorially substituted. d. 1,3 - diaxially substituted. Answer: C...
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