13. Consider the following reaction, which product is least likely to be observed?
(A)
(B)
(C)
(D)
(E)

12. Which of the following reactions produces the correct major product? (A)(B)(C)(D)(E)

19. Which of the following staternents for the unsaturated hydrocarbons is correct? (A) Benzene is more reactive than ethene toward hydrogenation reaction. (B) Combustion of acetylene releases more heat than benzene of the same weight. (C) Ethene is more reactive than benzene toward electrophilic substitution reaction. (D) Both benzene and acetylene have planar molecular geometry. (E) Addition of chlorine can be performed on acetylene, benzene and ethene under mild conditions.

14. PhosphatidyIglycerol is an important component in bacterial membrane and many anti-microbial peptides have been found to kill bacteria by the interaction with the membrane under  physiological conditions. Which of the following residues in the anti-microbial peptides is the most likely to bind to a membrane of Phosphatidylglycerol?(A) Arginine (B) Glycine (C) Glutamic acid(D) Serine(E) Cysteine

15. Which of the following comparisons of the intermolecular dispersion force is incorrect? (A) C3H7OH > C2H5OH (B) CCl4 > SiCl4 (C) Br2 >O2 (D) Ar> Ne (E) CH3CH2CH2Cl > (CH3)2CHCl

16. Which of the following is a chiral compound? (A) I (B) II  (C) III (D) IV (E) V

17. The osmotic pressure of a 0.010 M aqueous solution of potassium sulfate was measured to be 0.660 atm at 25 ℃. What is the van't Hoff factor (i) for this solution? (gas constant R = 0.082 atm L/mol-K) (A) 0.37 (B) 0.90 (C) 0.98 (D) 2.70 (E) 2.95

18. Which of the following compound names conforms to IUPAC nomenclature? (A) 1-methyl-2-bromobutane (B) 2,2-dibromo-3-chloropropane (C) 2-ethy1-3-chloropentane (D) 3-methy1-3-fluoropentane (E) 1,2-dichloro-3-nitrohexane

20. The dissolution of a strong electrolyte of type AmBn in water (which can be regarded as a special chemical reaction) is expressed as AmBn = An+(aq) + Bm-(aq), with enthalpy and entropy changes of △H and△S, respectively.Which of the following statements best describesthe dissolution of strong electrolytes of type AmBnof different compositions? (A) Both △H and△S are positive. (B) Both △H and△S are negative. (C) △H ispositive, and △S is negative. (D) △H may be positive or negative, and △S is positive. (E) Both △H and△S may be positive or negative.

21. Lysine H3N+(CH2)4CH(NH2)COO-(denoted by HR) is an essential amino acid, and its hydrochloride salt ([H3R]Cl2) exists in aqueous solution in the following equilibrium: When an NaOH solution is added to a certain concentration of [H3R]Cl2 solution, the distribution cocfficients δ(x) of H3R2+, H2R+,  HR, and R- vary with pH as shown on the right. Given that , which of the following statements is correct?(A)(B) At M, [CI-] + [OH-] +[R-] =2[H2R+] +[Na+] +H+] (C) [H2R+], [HR], and [R-] cannot be in the solution at the same time.  (D) (E) At P,[CI-]>[Na+]>[OH-] >[H+]

22. The use of N2O5 as a nitrifying agent is a new type of green nitrification technology, which has been widely used in industries such as energy-containing materials and pharmaceuticals. For the reaction 2N2O5(g) → 4NO2(g) + O2(g) ， the following reaction sequence was proposed, where it can be approximated that the second step does not affect the equilibrium of the first step. Which of the following statements is correct?(A) the rate of the reverse reaction of the first step<the rate of the reaction of the second step(B) The only intermediate product of the reaction is NO3.(C) The collision of NO2 with NO3 in the second step is only partially effective.(D) The activation energy of the reaction in the third step is higher than the other two.(E) The rate law of this reaction is rate = k[NO2][NO3].

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