31. Using Zaitsev's rule, choose the most stable alkene among the following.
(A)1-methylcyclohexene
(B)3-methylcyclohexene
(C) 4-methylcyclohexene
(D) They are all of equal stability according to Zaitsev's rule.

27. Which of the following alkyl halides reacts most rapidly via an SN1 solvolysis reaction in hot methanol? (A)1-iodohexane (B)1-fluorohexane (C) (R)-2-bromohexane(D)1-iodo-1-methylcyclohexane

28. When a SN1 reaction of R-2-iodobutane takes place in hot methanol, the product ________. (A)is chiral (B)will rotate plane polarized light (C) is racemic(D)will undergo a hydride shift

29. Identify the correct name for the following structure.(A)3-methoxy-5-methylcyclohepta-1,5-diene (B)6-methoxy-1-methylcyclohepta-1,4-diene (C) 7-methoxy-5-methylcyclohepta-1,4-diene(D)4-methoxy-2-methylcyclohepta-1,5-diene

30. For which of the following alkenes will cis- and trans- isomers not exist?(A)a) only (B)b) only (C) both a) and c)(D)d) only

32. Consider the constitutional isomers 2-methylbut-1-ene, 2-methylbut-2-ene, and 3-methylbut-1-ene. When each of these alkenes is subjected to catalytic hydrogenation (H2, Pt), a single product results. Which of the following best describes the structural relationship among these products? (A)The products are cis-trans isomers. (B)The products are identical. (C) The products are constitutional isomers.(D)The products are enantiomers.

33. Which of the following alkenes has the smallest molar heat of hydrogenation (ie, releases the least heat upon hydrogenation)? (A)2,3-dimethyl-2-butene (B)2-methyl-2-butene (C) trans-2-butene(D)cis-2-butene

34. HBr can be added to an alkene in the presence of peroxides (ROOR). What function does the peroxide serve in this reaction? (A)nucleophile (B)electrophile (C) radical chain initiator(D)acid catalyst

35. Provide the reagents necessary to complete the following transformation.(A)1. BH3∙THF 2. H2O2, HO- (B)H2O, H2SO4 (C) OsO4, H2O2(D)CH3CO3H

36. Which of the following is the best reaction sequence to use if one wants to accomplish a Markovnikov addition of water to an alkene with minimal skeletal rearrangement? (A)water + dilute acid (B)water + concentrated acid (C) oxymercuration-demercuration (D) hydroboration-oxidation

37. What is the correct IUPAC name for the following structure?(A)(Z) 4-methyl-3-hexen-1-thiol (B)(Z) 6-mercapto-3-methylhex-3-ene (C)( E ) 6-mercapto-3-methylhex-3-ene(D)( E ) 4-methylhex-3-en-1-thiol