7.Which one of the following cyclic alkanes has the greatest tendency to have a planar cyclohexan none of the above are planar Ans:A 8.What would be the proper name of the following: (C)3C 才H cis-1-tert-butyl-4-methylcyclohexane trans-1-tert-butyl-4-methylcyclohexane axial.equatorial-1-tert-butyl-4-methylcyclohexane cis-1-isopropyl-4-methylcyclohexane opopy-meyleyclohe 9.The most stable conformation of cis 1.3-dimethylcyclohexane has how many hydrogen atoms in axial positions? A)4 B)5 C)6 D)8 E)none of the above Ans:C 10.Which of the following stituted cyclohexanes could exist in a conformation is-4-dimethylcyclohexane trans-1,3-dimethylcyclohexane cis-1,2-dimethylcyclohexane E) All or none can have both groups equatorial s:A Page 3Page 3 7. Which one of the following cyclic alkanes has the greatest tendency to have a planar ring? A) cyclopropane D) cyclohexane B) cyclobutane E) none of the above are planar C) cyclopentane Ans: A 8. What would be the proper name of the following: CH3 H H (CH3)3C A) cis-1-tert-butyl-4-methylcyclohexane B) trans-1-tert-butyl-4-methylcyclohexane C) axial,equatorial-1-tert-butyl-4-methylcyclohexane D) cis-1-isopropyl-4-methylcyclohexane E) trans-1-isopropyl-4-methylcyclohexane Ans: A 9. The most stable conformation of cis 1,3-dimethylcyclohexane has how many hydrogen atoms in axial positions? A) 4 B) 5 C) 6 D) 8 E) none of the above Ans: C 10. Which of the following disubstituted cyclohexanes could exist in a conformation that has both groups equatorial? A) cis-1,3-dimethylcyclohexane B) cis-1,4-dimethylcyclohexane C) trans-1,3-dimethylcyclohexane D) cis-1,2-dimethylcyclohexane E) All or none can have both groups equatorial. Ans: A