18. How many of the following point groups do NOT have an inversion center? (3 pts) (a) C_I (b) C_i, (c) C₂ (d) (e) (f) S₆ (g) S₈ (h)I_h K (i) O(j)O_h
(A)4
(B)5
(C)6
(D)7
(E)8

1. What is the major product of the following reaction sequence? (2 pts) (A) (B)(C) (D) (E)

2. In the following sequence of reactions, Which of butene isomers contain(s) NO deuterium? (2 pts) (A) cis-2-butene (B) trans-2-butene (C) cis-2-butene and trans-2-butene (D) 1-butene (E) None of the above

3. Which compounds are named correctly? (2 pts) (A)Ⅰ,Ⅱ,Ⅲ；(B) Ⅳ,V,VI； (C)Ⅱ,IV,V； (D)Ⅲ,IV,VI； (E)VI,I,V.

4. Which ofthe following compound(s) would undergo racemization in the presence of base? (2 pts) (A)(B) (C)  (D) (E)         

5. A pyranose form is a cyclic hemiacetal with a six-membered ring. Which of the following compounds cannot exist in a pyranose form? (2 pts) (A) (B) (C) (D)(E)

6. Which of the compound can produce a secondary amine with the treatment of LiAIH4 in diethyl ether followed by H2O? (2 pts)(A) (B)(C) (D) (E)

複選題7. Based on the low-resolution proton NMR spectrum of a particular compound shown at the right, which of the following is(are) true? (2 pts) I. There are at least three different types of protons in this compound. Il. There are more protons of the type cotresponding to peak 3 than the type corresponding to peak 1. III. Protons of the type corresponding to peak 2 are more shielded than those corresponding to peak l.  (A) I only (B) II only (C) III only (D) I and II only (E) I, II, and III. 

8.Which of the following is the strongest base? (2 pts)(A)(B)(C)(D)(E)

9. Which of the following is a suitable synthesis of o-methylphenol? (2 pts)(A)(B)(C)(D)(E)

10. Which is the major product of the following reaction? (2 pts) (A)C6H5OH (B)(C)(D)(E)

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