26. Choose the structure J produced in the following reaction sequence.

(A)
(B)
(C)
(D)
(E)

27. Choose the structure consistent with the following data.C4H8O : 1H NMR spectrum, δ 1.05 (t, 3H), 2.13 (s, 3H), 2.47 (q, 2H)IR spectrum (strong peak near 1720 cm-1)(A) (B) (C) (D) (E)

28. Choose the correct order of molecular structures with respect to their ease for passing into the lipid bi-layer of a cell membrane. (the most difficult one is on the right) (A) A＞B＞C (B) B＞A＞C (C) B＞C＞A (D) C＞B＞A (E) C＞A＞B

29. Choose the product of the following reaction.(A) (B) (C) (D) (E)

30. Choose those reactants and reagents that would produce 2-methyl-2-butanol as the major product.(A) (a) + (b) + (c) (B) (a) + (b) (C) (a) + (c) (D) (a) (E) (c)

31. Choose the major product formed in the following reaction.(A) (B) (C) (D) (E)

32. Choose the reagents that would perform the following transformation. (A) PCC (B) 1. LiAlH4/Et2O, 2. H2O/H2SO4 (C) LiCu(CH3)2 (D) CH3MgBr (E) H3PO4

33. Choose the reactants and reagents that would produce 1-butene as the major product.(A) (a) + (b) (B) (b) (C) (a) (D) (c) (E) (a) + (c)

34. Normally, heating an initial aldol product (the β-hydroxyaldehyde) causes dehydration. However, heating the compound below with base does not cause dehydration, but rather, decomposition to form 2-ethylbutanal. This is because: (A) There are no protons β to the carbonyl. (B) There are no protons adjacent to the OH, and the dehydration reaction requires E1 conditions. (C) There are no protons α to the carbonyl, and aldol condensations are reversible. (D) Heating any organic compound above room temperature causes decomposition. (E) None of these is true.

35. Choose the correct statement given the following information:(A) Fe2+(aq) is more likely to be oxidized than Fe2+ complexed to CN-.(B) Fe3+(aq) is more likely to be reduced than Fe3+ complexed to CN-.(C) Both A and B are true.(D) Complexation of Fe ion with CN-has no effect on their tendencies to become oxidized or reduced.(E) None of these is true.

36. Which of the following additions to 2-methylpropene occurs with anti-Markovnikov orientation?(A) Catalytic hydrogenation (H2/Pt) (B) Addition of HOBr (C) Addition of HI(D) Addition of HBr in the presence of ROOR (E) Oxymercuration-Demercuration

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