27. As a new graduate student, you are about to begin a research project. Which of the following practices should you follow to get started?
(甲) Search and read the literature for one time
(乙) Keep searching and reading the literature all the time
(丙) The results and theory from the literature are always correct. I should not argue with them.
(丁) Always questioning the results published in scientific papers and in the literature
(戊) Before starting any experiment, form a logical expectation (hypothesis) for the outcome.
(A) 甲丁
(B) 乙丁戊
(C) 乙丁
(D) 丙戊

(E) None of the above

1. Which of the following methods is NOT suitable for the synthesis of Compound X?(A) 3-methylbut-1-yne (B) 3-methylbutan-2-ol +(C) methyl 2-methylpropanoate(D) acetonitrile (E) acetyl chloride 

2. How many peaks do you expect to see in the 1H NMR of Compound X (assuming the peaks do not overlap with each other)?(A) 2(B) 3(C) 4(D) 5(E) 6

3. Which of the following would be suitable reagents in Step 1?(A) i) KMnO4, ii) isopropanol, concentrated HCl(B) i) NaBH4, ii) CH3COCl(C) isopropanol, NaH(D) m-chloroperbenzoic acid(E) isopropanol, HCl

4. Which of the following would be the correct 1H NMR of Compound Y?(A) (B)(C) (D)(E) None of the above is correct

5. What is the most likely structure of product Z?(A) (B)(C)(D)(E)

6. Which of the following descriptions about the TLC analysis of Compound G and H is incorrect? (A) If "TLC 1" is a normal phase silica TLC plate, Compound H is more polar than Compound G.(B) If Compound G and H are analyzed again with a reverse phase silica TLC plate in EtOAc:n-hexane (3:2) then "TLC 2" could be the result.(C) "TLC 2" could be the result of running a normal phase silica TLC plate with EtOAc:n-hexane (2:3).(D) The Rf values of both compounds would change if the TLC is run with different ratios of EtOAc and n-hexane.(E) All of the above are incorrect

7. The highest occupied molecular orbital (HOMO) of 1,3,5-hexatriene is:(A)(B) (C) (D)(E)

8. What would be the major product of the following reaction?(A) (B) (C) (D)(E)

9. The reaction in question 8 is classified as a ...(A) [3,3] sigmatropic rearrangement(B) [6π] electrocyclization(C) [4+2] cycloaddition(D) [2+2] cycloaddition(E) [3+3] cycloaddition

10. What would be the major product of the following reaction?(A)(B) (C) (D) (E)

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