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6. (4 points) Which of the following statements best explains the pka difference between cyclohexanol and phenol? b. 3 a. cyclohexanol has a lower pka than phenol because sp'oxygens anions are more stable than sp² oxygen anions. b. phenol has a higher pKa than cyclohexanol because the conjugate base is resonance stabilized c. cyclohexanol has a lower pKa than phenol because pl-bonds destabilize the conjugate base of phenol d. phenol has a lower pKa than cyclohexanol sp² oxygens anions are more stable than sp¹ oxygen anions. 7. (4 points) How are the following compounds related? CH₂ CH, H₂ H₂ CH₂ H H CH₂ a. enantiomers b. diastereomers c. identical d. constitutional isomers 8. (4 points) Which reagents are needed to convert 1-octyne to 2-octanone? a. ozone followed by dimethyl sulfide b. hydrogen gas with a transition metal catalyst c. BH, in THF followed by NaOH, peroxide, and water d. HgSO4, H₂SO4, and water 9. (4 points) How many stereoisomers are possible for 1-bromo-6-methyl-4-heptene-2-ol? a. 5 c. 2 d. 4 10. (4 points) Which of the following methyl group will have the furthest upfield chemical shift? a. dimethyl ether b. dimethyl sulfide c. trimethyl amine d. tetramethyl silane