3. What is the major product in the following reaction sequence? 
(A) 
(B) 
(C) 
(D) 
(E)

40. 下列何者反應被歸類為威廉斯醚類和成(Williamson ether synthesis)？

32. 下列何者是合成 tert-butyl methyl ether 的最佳方法？ (A) CH3ONa + (CH3)3CBr → (B) (CH3)3CONa + CH3I → (C) (CH3)3CONa + CH3OCH3 → (D) CH3ONa + (CH3)3COH →

50. Which of the following ethers can’t be prepared by a Williamson ether synthesis? (A) t-Butyl phenyl ether (B) Isopropyl methyl ether (C) Anisole (D) t-Butyl methyl ether (E) None of the above.

38. 第三丁基甲基醚 (tert-butyl methyl ether) 是一種常用的有機溶劑，請問下面哪一個反應式， 以產率而言，最不適合用來合成 tert-butyl methyl ether？ (A) (B) (C) (D)

49. Which of the following synthetic procedures would be employed most effectively to transform ethanol into ethyl propyl ether? (A) 1. Ethanol, HBr 2. Mg, ether, then H3O 3. NaH, then CH3CH2Br (B) 1. Ethanol, HBr 2. Mg, ether, then HCHO, then H3O 3. NaH, then CH3CH2Br (C) 1. Ethanol 2. CH3CH2CH2OH 3. H2SO4, 140 °C (D) 1. Ethanol, NaH 2. HCHO, then H3O 3. HBr, then Mg, ether, then CH3CH2CH2Br (E) 1. Ethanol 2. H2SO4, 180 °C 3. CH3CH2CH2Br

4. Which of the following carboxylic acids would undergo decarboxylation readily when heated?  (A) I (B) II (C) III (D) IV (E) II and III

5. Two products can be obtained from the reaction below. One of the product is 2-Butanone. What is the most likely structure for the second product from the reaction? (A) (B) (C)  (D)  (E)

6. The aldol cyclization, followed by dehydration of 5-oxo-hexanal will give which product below. (A)  (B) (C) (D) (E) 

7. Predict the major structure of the expected product for the following reaction. (A) I (B) II (C) III (D) IV (E) V

8. What is the major product of the following reaction? (A) I (B) II (C) III (D) IV (E) V

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