109年 - [無官方正解]109 學士後招生考試_獸醫學系：化學(含普通化學、有機化學)#104289

1. A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 4.71 g/mL, 4.73 g/mL, 4.67 g/mL, 4.69 g/mL. If the actual value for the density of the sugar solution is 4.40 g/mL, which statement below best describes her results? (A)Her results are precise, but not accurate. (B)Her results are accurate, but not precise. (C)Her results are both precise and accurate. (D)Her results are neither precise nor accurate.

2. What answer should be reported, with the correct number of significant figures, for the following calculation? (249.362 + 41) / 63.498 (A)4.6 (B)4.57 (C)4.573 (D)4.5728

3. Write the name for Ca3(PO4)2. (A)calcium (III) phosphite (B)calcium (II) phosphite (C)calcium phosphate (D)tricalcium phosphorustetraoxide

4. Give the correct formula for aluminum sulfate. (A)Al2SO4 (B)Al(SO4)3 (C)Al3(SO4)2 (D)Al2(SO4)3

5. Determine the empirical formula for a compound that contains C, H and O. It contains 51.59% C and 35.30% O by mass. (C: 12.0 g/mol； H: 1.00 g/mol； O:6.0 g/mol) (A)C2H6O (B)CHO (C)C4H13O2 (D)CH4O3

6. Give the theoretical yield, in grams, of CO₂ from the reaction of 4.000 moles of with 4.000 moles of O₂. (C: 12.0 g/mol； H: 1.00 g/mol； O: 16.0 g/mol) 2 + 25 O₂ → 16 CO₂ + 18 H₂O (A)112.7 g (B)102.4 g (C)176.0 g (D)704.0 g

7. The titration of 25.0 mL of an unknown concentration H₂SO₄ solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H₂SO₄ solution (in M)? (A)0.20 M (B)0.40 M (C)0.10 M (D)0.36 M

8. How many subshells are there in the shell with n = 4? (A)3 (B)4 (C)6 (D)18

9. How many valence electrons does an atom of C have? (A)1 (B)4 (C)2 (D)3

10. Place the following in order of increasing radius.

11. Which of the elements listed below would most likely form a polar covalent bond when bonded to oxygen? (A)Mg (B)H (C)Al (D)O

12. Assuming the octet rule is obeyed, how many covalent bonds will an oxygen atom form to give a formal charge of zero? (A)0 (B)1 (C)2 (D)3

13. Which of the following Lewis structures is incorrect? (A)(B)(C)(D)

14. In the best Lewis structure for NO +, what is the formal charge on the N atom? (A)-1 (B)0 (C)+1 (D)+2

15. Which of the elements listed below is most likely to exhibit an expanded octet in its compounds? (A)O (B)S (C)Na (D)C

16. Give the number of lone pairs around the central atom and the molecular geometry of SCl₂. (A)0 lone pairs, linear (B)1 lone pair, bent (C)2 lone pairs, bent (D)3 lone pairs, bent

17. Use VSEPR theory to predict the geometry of the BF3 molecule. (A)linear (B)bent (C)trigonal planar (D)trigonal pyramidal

18. Which one of the following molecules has tetrahedral geometry? (A)XeF₄ (B)BF₃ (C)AsF₅ (D)CF₄

19. Which one of the following molecules has a non-zero dipole moment? (A)BeCl₂ (B)Br₂ (C)BF₃ (D)IBr

20. Which one of the following molecules is polar? (A)PBr₅ (B)CCl₄ (C)BrF₅ (D)XeF₂

21. What is the strongest type of intermolecular force present in NH₂CH₃? (A)dispersion (B)dipole-dipole (C)hydrogen bonding (D)ion-dipole

22. Identify the compound that does not have hydrogen bonding. (A)(CH₃)₃N (B)H₂O (C)CH₃OH (D)HF

23. What is the type of intermolecular force for dissolving NaCl in H₂O? (A)dispersion (B)dipole-dipole (C)hydrogen bonding (D)ion-dipole

24. What is the type of intermolecular force for dissolving Br₂ in H₂O? (A)dispersion (B)dipole-dipole (C)hydrogen bonding (D)induced dipole

25. Which of the following acids will have the strongest conjugate base? (A)HCl (B)HClO₄ (C)HNO₃ (D)HCN

26. Which one of the following salts, when dissolved in water, produces the solution with the lowest pH? (A)NaCl (B)KCl (C)MgCl₂ (D)AlCl₃

27. Which of the following is a Lewis acid? (A)BBr₃ (B)CCl₄ (C)NH₃ (D)CHBr₃

28. Which of the following is a Lewis base? (A)AlF₃ (B)H₂O (C)SiF₄ (D)

29. Which are acid-base reactions according to Lewis theory but not according to the Brønsted-Lowry theory?(A)I, II (B)III, IV (C)I, III, IV (D)I, II, III, IV

30. Which acid is the most acidic?

(A)I (B)II (C)III (D)IV

31. Which is the IUPAC name for the following cycloalkane? (A)2,4-dimethyl-1-ethylcyclopentane (B)1,3-dimethyl-5-ethylcyclopentane (C)1-ethyl-2,4-dimethylcyclopentane (D)1-ethyl-3,5-dimethylcyclopentane

32. Which conformation of pentane is most stable? (A)I (B)II (C)III (D)IV

33. Which of these diaxial conformations has the highest energy? (A)I (B)II (C)III (D)IV

34. Which structure is Z-2-bromo-3-methyl-2-pentene? (A)I (B)II (C)III (D)IV

35. Arrange these carbocations in order of increasing stability (least to most). (A)I, II, III (B)I, III, II (C)II, I, III (D)III, II, I

36. Which of the following alkenes is the major product when 2-bromo-2-methylpentane is treated with sodium ethoxide in ethanol? (A)2-methylpent-1-ene (B)2-methylpent-2-ene (C)-4-methylpent-2-ene (D)(Z)-4-methylpent-2-ene

37. Which of the following alkenes is the major product when 2-bromo-2-methylpentane is treated with potassium tert-butoxide in tert-butanol? (A)2-methylpent-1-ene (B)2-methylpent-2-ene (C)-4-methylpent-2-ene (D)(Z)-4-methylpent-2-ene

38. Which of the following statements applies to the E2 mechanism? (A)It occurs with inversion of stereochemistry. (B)It occurs with racemization of stereochemistry. (C)It proceeds through the more stable carbocation intermediate. (D)The C-H and C-X bonds that break must be anti.

39. What is the major product of the following reaction? (A)(B)(C)(D)

40. Provide the reagents necessary to complete the following transformation. (A)1. BH₃∙THF 2. H₂O₂, HO- (B)H₂O, H₂SO₄ (C)OsO₄, H₂O₂ (D)CH₃CO₃H

41. Which of the following reagents will convert 1 mole of 3-methylpent-1-yne into 3-methylpentane? (A)1 mole of Br₂ in CCl₄ (B)2 moles of Cl₂ in CCl₄ (C)2 moles of HCl (D)2 moles H₂, Ni and heat

42. Which of the following reagents should be used to convert to (A)H2, Pt (B)Na, NH₃ (C)H₂, Lindlar's catalyst (D)H₂SO₄, H₂O

43. Which of the following statements correctly pertains to a pair of enantiomers? (A)They rotate the plane of polarized light by exactly the same amount and in opposite directions. (B)They rotate the plane of polarized light by differing amounts and in opposite directions. (C)They rotate the plane of polarized light by differing amounts and in the same direction. (D)The have different melting points.

44. Predict the specific rotation of the compound shown. (A)It is impossible to predict； it must be determined experimentally. (B)Because both asymmetric centers are R, the compound is dextrorotatory. (C)Because both asymmetric centers are S, the compound is levorotatory. (D)Zero； the compound is achiral.

45. What is the major difference between an antiaromatic and aromatic compound? (A)Only aromatic compounds follow Huckle's rule. (B)Antiaromatic compounds have at least one sp3 hybridized atom in the ring. (C)Antiaromatic compounds can assume a chair-like structure while aromatic compounds are nearly flat. (D)Aromatic compounds cannot have a charged atom in the structure.

46. Which of the following is an incorrect statement about the bromination of benzene by Br₂ and FeBr₃? (A)FeBr₃ functions to increase the electrophilicity of Br₂. (B)Formation of the sigma complex is the rate-determining step of the mechanism. (C)The carbanionic intermediate is resonance stabilized. (D)There is one carbon-containing intermediates in the mechanism.

47. Which of the following species is attacked by benzene in the electrophilic nitration reaction? (A)HNO₃ (B)NO₂+ (C)NO₂ (D)NO+

48. Which of the following compounds will not undergo Friedel-Crafts acylation when treated with (A)toluene (B)p-xylene (C)benzophenone (D)ethoxybenzene

49. Which series of reagents would be required to perform the following synthesis? (A)1. ClCH2CH2CH3, AlCl3 2. FeBr3, Br2 (B)1. ClCOCH2CH3, AlCl3 2. FeBr3, Br2 (C)1. ClCOCH2CH3, AlCl3 2. FeBr3, Br2 3. Zn(Hg), HCl (D)1. ClCOCH2CH3, AlCl3 2. Zn(Hg), HCl 3. FeBr3, Br2

50. What are the expected products of the reaction of PhOCH3 with concentrated HI? (A)phenol and methanol (B)phenol and iodomethane (C)iodobenzene and methanol (D)iodobenzene and iodomethane

51. Which of the following is produced by the reaction of (CH₃CH₂)₂S with CH₃CH₂I? (A)CH₃CH₂CH₂CH₂I (B)(CH₃CH₂)3S+ I- (C)(CH₃CH₂)₃S (D)CH₃SCH₂CH₂CH₃

52. Through what basic mechanism is 1-methylcyclohexanol converted to 1-bromo-1-methylcyclohexane upon treatment with HBr? (A) (B) (C)E1 (D)E2

53. What is the major organic product of the following reaction? (A)(B)(C)(D)Both A and B

54. What is the best way to make the ether shown below using a Williamson Ether Synthesis reaction? (A)(CH3)3CO- + BrCH3 (B)(CH3)3CBr + -OCH3 (C)(CH3)3COH + BrCH3 (D)(CH3)3CBr + HOCH3

55. When an aldehyde is treated with LiAlH4 followed by addition of H2O, what general class of product results? (A)primary alcohol (B)secondary alcohol (C)tertiary alcohol (D)ether

56. What is the correct IUPAC name of the compound below? (A)3-(2-bromopropyl)-6,6-dimethylheptan-2-ol (B)5-bromo-3-(3,3-dimethylbutyl)hexan-2-ol (C)5-(2-bromopropyl)-2,2-dimethylheptan-6-ol (D)7-bromo-5-(1-hydroxyethyl)-2,2-dimethyloctane

57. The reaction of CH3CH2MgBr with CH₃COCH₂CH₃ gives ________. (A)an achiral product (B)a mixture of diastereomers (C)the racemate of a chiral product (D)a single enantiomer

58. The acidity of a thiol proton most closely resembles which of the following acids? (A)pheno (B)ethanol (C)acetic acid (D)ammonia

59. The positively polarized carbon atom of a carbonyl group acts as ________. (A)an electrophile and a Lewis base (B)a nucleophile and a Lewis base (C)an electrophile and a Lewis acid (D)a nucleophile and a Lewis acid

60. What reagent can be used to convert 2-methylbutan-1-ol into 2-methylbutanal? (A)LiAlH₄ (B)Na₂Cr₂O₇ (C)PCC (D)KMnO₄

61. Which sequence ranks the following carbonyl compounds in order of increasing rate of nucleophilic addition? (A)2 ＜ 3 ＜ 1 (B)3 ＜ 2 ＜ 1 (C)2 ＜ 1 ＜ 3 (D)1 ＜ 3 ＜ 2

62. What product will result from the reaction shown? (A)imine (B)amino acid (C)amino alcohol (D)hydrazine

63. What product will result from the reaction shown? (A)acetal (B)hydrazine (C)ester (D)ylide

64. The cyclic structure of glucose is shown below. What functional groups are present in this molecule? (A)acetal (B)hemiacetal (C)oxime (D)hydrate

65. Provide the correct IUPAC name for the following amine. (A)4-(methylamino)-2-methyl-1-pentene (B)2,N-dimethyl-1-penten-4-amine (C)4,N-dimethyl-4-penten-2-amine (D)1,3,N-trimethyl-3-buten-1-amine

66. What compound results from the reaction below? (A)imine (B)amide (C)primary amine (D)quaternary ammonium salt

67. List the following weak acids in order of increasing acidity (from lowest to highest.). (A)4 ＜ 3 ＜ 2 ＜ 1 ＜ 5 (B)4 ＜ 1 ＜ 3 ＜ 2 ＜ 5 (C)5 ＜ 2 ＜ 3 ＜ 1 ＜ 4 (D)4 ＜ 1 ＜ 2 ＜ 5 ＜ 3

68. Which of the following sequences ranks the structures below in order of increasing acidity? (A)1 ＜ 2 ＜ 3 (B)2 ＜ 3 ＜ 1 (C)3 ＜ 1 ＜ 2 (D)2 ＜ 1 ＜ 3

69. What compound is produced when (CH3)2CHCH2Br is subjected to the following sequence of steps? 1. Mg, Et₂O 2. CO₂ (A)2-methylpropanoic acid (B)3-methylpropanoic acid (C)2-methylbutanoic acid (D)3-methylbutanoic acid

70. Acid chlorides can be prepared from carboxylic acids by treatment with ________. (A)(COCl)₂ (B)SOCl₂ (C)KCl (D)both A and B

71. Cyclic amides are called ________. (A)lactones (B)lactams (C)aminals (D)animals

72. What is the correct IUPAC name for the following compound? (A)N-ethyl-2,N-dimethylbutanamide (B)N-ethyl-N-methylisobutyramide (C)2,N-dimethyl-N-ethylbutanamide (D)1-(ethylmethylamino)-2-methylbutanamide

73. Arrange the carboxylic acid derivatives below in order of increasing reactivity towards nucleophilic acyl substitution. (A)1 ＜ 2 ＜3 (B)1 ＜ 3 ＜ 2 (C)2 ＜ 1 ＜ 3 (D)2 ＜ 3 ＜ 1