6. Which of the following statements regarding chair cyclohexane is wrong? a) The dihedral angle of the two axial bonds

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6 Which Of The Following Statements Regarding Chair Cyclohexane Is Wrong A The Dihedral Angle Of The Two Axial Bonds 1 (191.69 KiB) Viewed 56 times

6 Which Of The Following Statements Regarding Chair Cyclohexane Is Wrong A The Dihedral Angle Of The Two Axial Bonds 2 (55.25 KiB) Viewed 56 times

6. Which of the following statements regarding chair cyclohexane is wrong? a) The dihedral angle of the two axial bonds on adjacent carbons is 180°. b) The dihedral angle of the two equatorial bonds on adjacent carbons is 60°. c) The dihedral angle between the axial bond and the equatorial bond on adjacent carbons is 120°. d) The axial hydrogen atoms on C1, C3, and C5 form an equilateral triangle (as do CI, C3, and C5 themselves and the equatorial hydrogens on them). 7. Which of (a)-(d) is not aromatic? a) b) d) 8. Which is the most stable structure of 1-isopropyl-4-methylcyclohexane? H CH, CH(CH3)2 H CH(CH3)2 CH H H b) a) C(CH3)2 C(CH3)2 H -H H CH, CH, d) H c)

ch of the following can exist as cis-trans isomers? cyclohexane a. b. methylcyclohexane c. 1,1-dimethylcyclohexane d. 1,2-dimethylcyclohexane 2- In methylcyclohexane: a. all carbon atoms are sp3 hybridized. c. b. ring-carbon atoms are sp2 hybridized and the methyl group is sp3 hybridized. all bond angles are approximately 120°. d. ring-bond angles are approximately 120° and the ring-methyl bond angle is approximately 109 3- Which of the following would have the smallest strain energy (kJ/mol)? cyclobutane b. cyclopentane cyclohexane d. cyclooctane a. c. 4. The specific rotation of a compound is denoted by the symbol: a R b. S c. а [a], d. 5. Which of the following statements regarding cycloalkanes is wrong? a) Any disubstituted cycloalkane can have cis-trans isomers. b) The planar form of any cycloalkane with a ring larger than cyclopropane will not be the most stable conformation c) Cyclopentane is nonplanar to avoid the torsional strain between adjacent C-H bonds. 13