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

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

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.

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

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

38. The reaction of CH3CH2MgBr with CH3COCH2CH3 gives ________. (A)an achiral product (B)a mixture of diastereomers (C) the racemate of a chiral product(D)a single enantiomer

39. Which alcohol reacts most rapidly with the Lucas reagent? (A)benzyl alcohol (B)methanol (C) 2-propanol(D)isobutanol

40. Which of the following oxidants will convert a primary alcohol to an aldehyde?1) sodium dichromate /sulfuric acid 3)pyridinium chlorochromate2) copper oxide 4) dimethylsulfoxide, oxalyl chloride (A)3 & 4 (B)2, 3, & 4 (C) 3(D)1, 2, 3, & 4