10. How many of the following compounds is/are aromatic?
  
(A)1
(B)2
(C)3
(D)4

11. How many of the following compounds is/are more basic than triethylamine?(Ⅰ ) pyridine (II) pyrole (IIl) sodium methoxide (IV) lithium diisopropylamide (A)1 (B)2 (C)3 (D)4

12. How many of the following reagents should transform cyclohexene to alcohol after normal workup? (I) BH3 then H2O2/OH-(II) OsO4 then NaHSO3 (III)Hg(OAc) 2then NaBH4 (IV) MCPBA then H2O/H+ (A)1 (B)2 (C)3 (D)4

13. How many of the following statements about radicals is/are correct? (I) Radicals can be generated efficiently in the presence of BHT. (I) ABIN is a common radical initiator. (III) In the step of radical propagation, both heat and the number of free radicals increase. (A)0 (B)1 (C)2 (D)3

14. Which of the following compounds would not undergo racemization in base? (A) (S)-3-methy1-4-heptanone (B) (S)-3-ethy1-2-heptanone (C) (R)-4-cthyl-2-heptanone(D) (R)-2,4-dimethy1-3-heptanone

15. Which is the major product of the following reaction?(A)(B)(C)(D)

16. Among the following solvents, which is the best for the reaction of I-bromohexane with sodium azide?(A)dimethyIsulfoxide (B) methanol (C) hexane(D)toluene

17. Which of the following transformations might be used to synthesize the following substance?(A)(B)(C)(D)None of abover answers

18. What is most likely to be the final product when cyclopentene is subjected to the following reaction scquence: (I) H+/H2O；(II) PCC；(IIl) piperidine； (IV) NaBH3CN?(A)(B)(C)(D)

19. How many of the following transformations is/are likely to be practical?   (A)0 (B)1 (C)2 (D)3

20. How many of the following statements regarding bromination (Br2/FeBt3) of toluene is/are correct? ( A ) Reaction begins with the complexation of bromine with the FeBr3 ( B ) Formation of Br+ ion is not the rate determining step ( C ) Addition of Br+ to toluene to form the arenium ion is the rate determining step ( D ) 4-Bromotoluene is formed by losing a hydride from the arenium ion (A)1 (B)2 (C)3 (D)4

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