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• 49. 增強型n通道MOSFET若工作在主動區則 (A)閘汲極正電壓，閘源極正電壓 (B)閘汲極正電壓，閘源極負電壓 (C)閘汲極負電壓，閘源極正電壓 (D)閘汲極負電壓，閘源極負電壓
• 50. 如圖【10】所示為555之無穩態多諧振盪電路， 試問充電路徑包含哪幾個元件？ (A) R2及C (B) C (C) R1及R2 (D) R1及R2及C
• 10.For the following reaction sequence, which molecule is expected as the major product? (A)(B)(C)(
• 11.Examine the transforration shown below and then indicate which of the following statements is cor
• 12. A professor wanted to invent a C-H oxidation reaction, in which n-pentane could be oxidized to g
• 13. A graduate student found four reagent vials (I, II, III, IV) with unclear labels. A lab manager
• 14. One of the following chloronorbornanes undergoes E2 eiimination much faster than others. Conside
• 15.A student reported that an acid (H+X- ) promoted a reaction of the epoxide to give a product. By
• 16. Based on your knowledge of current organic chemistry, which of the following reactions leads to
• 17. What is the major product for the following reaction? (A)(B)(C)(D)(E)
• 18. Which of the following reactions will NOT give a ketone as a major product? (A)(B)(C)(D)(E)
• 19. Which of these reactions will NOT give a phenol as a major product? (A)(B)(C)(D)(E)
• 20.Which one of the listed compounds is consistent with the following NMR spectrum?(A)(B)(C)(D)(E)
• 21. Which pair of reagents would produce the highest yield of (R)-2-ethoxybutane? (A)sodium (S)-2-bu
• 22.Which of the following represents the highest occupied molecular orbital for the conjugated pi sy
• 23. When 1 mole of anbydrous HC1 is reacted with excess 1,3-pentadiene, the 1,2 and the 1,4-addition
• 24. Which of the following aromatic compounds wil have the most significant number of signals in a 1
• 25. Choose the best reagent(s) from the list below for the following conversions. Place the letter o
• 26. Which of the following could successfully undergo a Friedel-Crafts alkylation? Assume an appropr
• 27. Choose the BEST reagent for each of the following conversions.(A)LiAJH4, THF (B)NaBH4, ethanol (
• 28. Which labeled peaks would distinguish an aldehyde from a ketone based on this spectrum? (A)1 (B)
• 29. Which labeled peaks would distinguish an aldehyde from a ketone based on this spectrum? (A)1 (B)
• 30. In the diagram below, fill in the terms in the appropriate places indicated by a letter.(A)A - r
• 31. Consider the following diagram. Which letter should be filled in on the bottom line? (A)GCU(B)UC
• 32. Which of the following monomers is least readily polymerized under anionic polymerization condit