27. Which of compounds can be reduced by sodium borohydride ?
(A) 2-butanol
(B) butyric acid
(C) 2-butene
(D) 3-pentanone

複選題23. What statement is NOT true about standard electrode potentials? (A) E° cell is positive for spontaneous reactions. (B) Electrons will flow from more negative electrode to more positive electrode. (C) The electrode potential of the standard hydrogen electrode is exactly zero. (D) E° cell is the difference in voltage between the anode and the cathode. (E) The electrode in any half-cell with a greater tendency to undergo reduction is positively charged relative to the standard hydrogen electrode and therefore has a positive E°.

24. What will happen during gamma ray emission. (A) The mass number and atomic number decrease. (B) The mass number and atomic number increase. (C) The mass number is unchanged and the atomic number decreases. (D) The mass number is unchanged and the atomic number increases. (E) The mass number and atomic number do not change.

25. Identify the element that is not used as a radioactive tracer. (A) iron-59 (B) phosphorus-32 (C) thallium-201 (D) iodine-131 (E) carbon-13

26. How many chiral centers are there in the following molecule? (A) 4 (B) 5 (C) 6 (D) 7

複選題28. Among the following compounds, how many are aromatic? (A)4  (B)5   (C)6   (D)7

29. Predict the major product of the following reaction: (A) (B) (C) (D)

30. Which reagent(s) are necessary to carry out the following reaction ?(A) (B) (C) (D)

31. Which of the following reagents would convert 2-butanol into 2-bromobutane ? (A) Br2/CCI4 (B) Br2/light; heat (C) PBr3/pyridine (D) CuBr2/MeOH

32. Choose the possible process to produce Isobutylbenzene.(A) (B) (C) (D)

33. Which is major product of following reaction? (A) (B) (C) (D)all of the above is incorrect.