64. How many stereocenters (chiral centers) are present in this molecule? H3C CH3 B. 3 A. 4 . 2 D. I CI CHCH3 65. Which of the following is a reaction diagram for an S1 reaction that is endothermic? A. 13. D. 66. From the data given in the right-hand box, what is the specific rotation of the alcohol produced in the Sn2 reaction shown below? Data OH -OH CHICHS C,H13CHCH, CICH3 HO Br CH13 CeH13 [alp =-34.6 [alp = ? lalo = -9.9 %3D (A) +34.6 (B) +9.9 (C) 0.0 (D) -9.9 67. Which set of reagents would be best for this reaction? A. HCO,H, then H,0 B. OsO,/Na, SO,/H,0 C. Cro, H,SO, D. O, then NABH, OH HO, 64. How many stereocenters (chiral centers) are present in this molecule? H3C CH3 B. 3 A. 4 . 2 D. I CI CHCH3 65. Which of the following is a reaction diagram for an S1 reaction that is endothermic? A. 13. D. 66. From the data given in the right-hand box, what is the specific rotation of the alcohol produced in the Sn2 reaction shown below? Data OH -OH CHICHS C,H13CHCH, CICH3 HO Br CH13 CeH13 [alp =-34.6 [alp = ? lalo = -9.9 %3D (A) +34.6 (B) +9.9 (C) 0.0 (D) -9.9 67. Which set of reagents would be best for this reaction? A. HCO,H, then H,0 B. OsO,/Na, SO,/H,0 C. Cro, H,SO, D. O, then NABH, OH HO, 64. How many stereocenters (chiral centers) are present in this molecule? H3C CH3 B. 3 A. 4 . 2 D. I CI CHCH3 65. Which of the following is a reaction diagram for an S1 reaction that is endothermic? A. 13. D. 66. From the data given in the right-hand box, what is the specific rotation of the alcohol produced in the Sn2 reaction shown below? Data OH -OH CHICHS C,H13CHCH, CICH3 HO Br CH13 CeH13 [alp =-34.6 [alp = ? lalo = -9.9 %3D (A) +34.6 (B) +9.9 (C) 0.0 (D) -9.9 67. Which set of reagents would be best for this reaction? A. HCO,H, then H,0 B. OsO,/Na, SO,/H,0 C. Cro, H,SO, D. O, then NABH, OH HO, 64. How many stereocenters (chiral centers) are present in this molecule? H3C CH3 B. 3 A. 4 . 2 D. I CI CHCH3 65. Which of the following is a reaction diagram for an S1 reaction that is endothermic? A. 13. D. 66. From the data given in the right-hand box, what is the specific rotation of the alcohol produced in the Sn2 reaction shown below? Data OH -OH CHICHS C,H13CHCH, CICH3 HO Br CH13 CeH13 [alp =-34.6 [alp = ? lalo = -9.9 %3D (A) +34.6 (B) +9.9 (C) 0.0 (D) -9.9 67. Which set of reagents would be best for this reaction? A. HCO,H, then H,0 B. OsO,/Na, SO,/H,0 C. Cro, H,SO, D. O, then NABH, OH HO,