資訊推薦

• 18. Which of the following is not a valid resonance structure for N3-?(A)(B)(C)(D)(E) All are valid.
• 35. Provide the reagents necessary to complete the following transformation.(A)1. BH3∙THF 2. H2O2, H
• 36. Which of the following is the best reaction sequence to use if one wants to accomplish a Markovn
• 37. What is the correct IUPAC name for the following structure?(A)(Z) 4-methyl-3-hexen-1-thiol (B)(Z
• 19. Consider the following molecules.Ⅰ.BF3Ⅱ.CHBr3 (C is the central atom.)III. Br2 IV. XeCl2V. COVI.
• 20. Which of the following is diamagnetic? (A) H2+ (B) C2+ (C) N2+ (D) N2 (E) F2+
• 38. The reaction of CH3CH2MgBr with CH3COCH2CH3 gives ________. (A)an achiral product (B)a mixture o
• 39. Which alcohol reacts most rapidly with the Lucas reagent? (A)benzyl alcohol (B)methanol (C) 2-pr
• 21. Below is a phase diagram for compound X. You wish to purify a sample of X that was collected at
• 40. Which of the following oxidants will convert a primary alcohol to an aldehyde?1) sodium dichroma
• 22. Alkali halides commonly have either the sodium chloride structure or the cesium chloride structu
• 23. Liquid A has vapor pressure x. Liquid B has vapor pressure y, and x>y.What is the mole fracti
• 24. The oxidation states of P in KPF6 is: (A)+1 (B)+3 (C)+5 (D)-3 (E) -5
• 25. Which of the following compounds is the strongest acid? (A) Acetic acid (B) Chloric acid (C) Hyp
• 26. Which of the following ions has the lowest standard reduction potential? (A) Ag+ (B) Fe3+(C) Cr3
• 27. Which of the following names of ions is incorrect? (A) stannous: Sn2+ (B) plumbous: Pb2+ (C) fer
• 28. The density of compound XHn as gas is 2.393 times that of O2. If 0.01 mol of this compound react
• 29. Which of the following compound can be dissolved in water easily? (A) CsCl (B) AgCl (C) BaSO4 (D
• 30. Which of the following statements is correct? (A) NaF: acidic, cation acts as an acid )(B)NH4CI:
• 41. What are the relative integrations for the 1H NMR signals for the following compound?(A)3:1:2:2
• 31. Which of the following statements is correct for a mercury cell to produce chlorine and sodium h
• 42. If a molecule contains 4 elements of unsaturation and signals in the 1H NMR spectrum between δ
• 43. Using a 60 MHz spectrometer, the protons in dichloromethane appear at 5.30 ppm. When the same sa
• 44. Which of the following is another name for cyclobutadiene? (A)[2]annulene (B)[4]annulene (C) [6]
• 45. In electrophilic aromatic substitution reactions a bromine substituent ________. (A)is a deactiv