63. The reaction of CH3CH2MgBr with CH₃COCH₂CH3 gives. :
(A) an achiral product.
(B) a of diastereomers. ；
(C) the racemate of a chiral product.
(D) a single enantiomer.
(E) none of the above.

59. A galvanic cell consists of a left compartment with a tin electrode in contact with 0.1 M Sn(N03)2(aq) and a right compartment with a lead electrode in contact with 1 ✖ 10 -3M Pb(NO3)2(aq). The relevant reduction potentials are:   When this cell is allowed to discharge spontaneously at 25°C, which of the following statements is true? (A) Electrons will flow from left to right through the wire. (B) Pb2+ ions will be reduced to Pb metal.  (C) the concentration of Sn2+ ions in the left compartment will increase. (D) The tin electrode will be the cathode. (E) No noticeable change will occur, because the cell is at equilibrium.

60. Consider the galvanic cell shown below (the contents of each half-cell are written beneath each compartment): The standard reduction potentials are as follows: Which of the following statements about this cell is false? (A) This is a galvanic cell. (B) Electrons flow from the Pt electrode to the Cr electrode. (C) Reduction occurs at the Pt electrode. (D) The cell is not at standard conditions. (E) To complete the circuit, cations migrate into the left half-cell and anions migrate into the right half-cell from the salt bridge. II. Choose one correct answer for the following questions

61. Which of the following compounds is the strongest acid? (A)p-nitrobenzoic acid (B)p-bromobenzoic acid (C) m-methylbenzoic acid (D) m-methoxybenzoic acid (E) water

62 Which of the following cvcloalkenes would be expected to be stable? (A) 1&2 (B)2&3 (C)2 (D)l&3 (E) none are stable 

64.The, nrnton?： marked and Hh in the molecule below are___________. (A) chemically equivalent (B) enantiotopic (C) diastereotopic  (D) endotopic (E) none of the above 

65. Consider the spectrum illustrated below.  Which of the following structure will be best for this spectrum?(A)(B)(C)(D)(E) None ofthe above

66. Consider the following two spectrums which are from the same compound BC,(A)(B)(C)(D)(E) None ofthe above

67. wh il1 be the major product ofadamantane (shown below) reacted with Br2 with the presence ofperoxide?(A)(B)(C)(D)(E) None of the above

68. Consider the following reaction.BY   is  (A)(B)(C)(D)(E)

69. Chemists develop several methods for preparation of ester. Using your knowledge, indicate the method which could not give ester as product. (A) Fischer esterfication (B) Reaction of acyl chloride and alcohol (C) Acyl transfer from acid anhydride to an alcohol (D) Baeyer-Villiger oxidation of ketones (E) None of the above