(Test Bank) Organic Chemistry

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Chemistry

Test Bank

1st Edition

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Test Bank for Organic Chemistry, The downloadable file consists of 956 pages, and the total size of the file is 3.08 MB. Purchase now only for highly discounted price.

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Chapter 1 1MULTIPLE CHOICE QUESTIONS Topic: Atomic Orbitals 1. In quantum mechanics a node (nodal surface or plane) is: A) a place where Ψ is negative. B) a place where Ψ is positive. C) a place where Ψ = 0. D) a place where Ψ 2 is large. E) a place where Ψ2 is negative. Ans: C Topic: Atomic Orbitals, Molecular Orbitals 2. When the 1 s orbitals of two hydrogen atoms co mbine to form a hydrogen molecule, how many molecular or bitals are formed? A) 1 B) 2 C) 3 D) 4 E) 5 Ans: B Topic: Atomic Orbitals 3. Which principle(s) or rule must be used to determine the correct electronic configuration for carbon in its ground state? A) Aufbau Principle B) Hund's Rule C) Pauli Exclusion Principle D) (A) and (B) only E) All three Ans: E Chapter 1 2Topic: Atomic Orbitals, Bonding 4. What point on the potential energy diagram be low represents the most stable state for the hydrogen molecule? A) I B) II C) III D) IV E) V Ans: C Topic: Atomic Orbitals, Molecular Orbitals 5. According to molecular orbital theo ry, which molecule could not exist? A) H 2 B) He 2 C) Li 2 D) F 2 E) N 2 Ans: B Topic: Atomic Orbitals, Molecular Orbitals 6. When the ls orbitals of two hydrogen at oms combine to form a hydrogen molecule, which molecular orbitals are formed? A) One bonding molecular orbital only B) Two bonding molecular orbitals C) One bonding molecular orbital and one antibonding molecular orbital D) Two antibonding molecular orbitals E) Three bonding molecular orbitals Ans: C Chapter 1 3Topic: Atomic Orbitals, Hybridization 7. The following electron conf iguration represents _______. 1s 2sp32sp32sp32sp3 A) the ground state of boron. B) the sp3 hybridized state of carbon. C) the sp3 hybridized state of nitrogen. D) the ground state of carbon. E) an excited state of carbon. Ans: C Topic: Atomic Orbitals, Molecular Orbitals 8. According to molecular orbital theory, in the case of a carbon-carbon double bond, the carbon-carbon bonding electrons of higher energy occupy this molecular orbital. A) σ bonding MO B) π bonding MO C) σ * antibonding MO D) π* antibonding MO E) π* bonding MO Ans: B Topic: Atomic Orbitals, Hybridization 9. Identify the atomic orbitals in the C-C sigma bond in ethyne. A) (2sp 2, 2sp2) B) (2sp3, 2sp3) C) (2sp, 2sp) D) (2p, 2p) E) (2sp, 1s) Ans: C Chapter 1 4Topic: Lewis Structures, Formal Charges 10. Listed below are electron dot formulas fo r several simple molecules and ions. All valence electrons are shown; however, electrical charges have been omitted deliberately. HH H H H H I II III IV VH : Be : H H : B : HH : N : HH : N : HH : O : H.. .. .. .. .. .. .. .. Which of the structures actua lly bear(s) a positive charge? A) I B) II C) III D) III & V E) IV & V Ans: E Topic: Lewis Structures, Formal Charges 11. What is the formal charge on oxygen in the following structure? O H3CC H 3 CH3.. A) +2 B) +1 C) 0 D) -1 E) -2 Ans: B Chapter 1 5Topic: Lewis Structures, Formal Charges 12. In which structure(s) below does th e oxygen have a formal charge of +1? O CHH OH OHH HO H3CC H 3 CH3 II III IV I.. .. .. .. :.. H s A) I only B) II only C) I and III D) I and IV E) I, III, and IV Ans: E Topic: Lewis Structures, Formal Charges 13. Which structure(s) contai n(s) an oxygen that bears a formal charge of +1? O H3CC H 3 CH3 IVO H3CH H IIIOCO IIOCHO IOC OO V.. .. ..: :.. .... ::: .... ::: ..:: A) I and II B) III and IV C) V D) II E) I and V Ans: B Chapter 1 6Topic: Lewis Structures, Formal Charges 14. Which of the following molecules or ions has a nitrogen with a form al charge of -1? (Charges on ions have been omitted.) A) NH H..: B) N HH H.. C) N HC H 3 H.. D) N H3CC H 3 H.. E) C H3CN : Ans: A Topic: Lewis Structures, Formal Charges 15. In which structure(s) below does n itrogen have a formal charge of +1? N H3CC H 3 CH3N H3C CH2 HN H3CH NH2 H3C IV III II IVNH OH H.. .. .. .... .. .. A) I B) II and IV C) III and V D) I and V E) V Ans: A Chapter 1 7Topic: Lewis Structures, Formal Charges 16. Which of the following is an ion with a single negative charge? A) O H3C.. :.. B) ONO..: :.. .... C) ONOO .... :::: :.. D) All of these E) None of these Ans: D Topic: Lewis Structures, Formal Charges 17. Which of these is a correct electron- dot representation of the nitrite ion, NO 2-? IVIII II I V: O : N : : O : O : : N : O : : O : : N : : O : O : N : O : : O : : N : O.. .... .. .... .. .... .. .... .. .. .. ...... .. .... .... A) I B) II C) III D) IV E) V Ans: A Chapter 1 8Topic: Lewis Structures, Formal Charges 18. Which is NOT a correct Lewis structure? A) N H F H.. ..: B) CHF HH :.. .. C) OHO.. ..H.. .. D) OBOO .... ::.. ..HH H E) None of these Ans: A Topic: Lewis Structures, Formal Charges 19. Listed below are electron dot formulas fo r several simple molecules and ions. All valence electrons are shown; however, electrical charges have been omitted deliberately. HH H H H H II V V II IIIH : Be : H H : B : HH : N : HH : N : HH : O : H.. .. .. .. .. .. .. .. Which of the structures is negatively charged? A) I B) II C) III D) IV E) V Ans: B Chapter 1 9Topic: Lewis Structures, Formal Charges 20. Which compound contains a nitrogen atom with a formal positive charge? H N NN II I III A) I B) II C) III D) More than one of the above E) None of the above Ans: D Topic: Lewis Structures 21. Considering Lewis structures, which of these compounds possesses a single unpaired electron? A) N 2 B) N 2O C) NO D) N 2O4 E) O 2 Ans: C Topic: Lewis Structures 22. YZ Y.. .. is a generalized structural representa tion which can be used for all of the following, except: A) OF 2 B) NH 2– C) H 2S D) BeBr 2 E) There is no exception Ans: D Chapter 1 10Topic: Lewis Structures, Formal Charges 23. In which of these cases does the central atom have a zero formal charge? A) HFH B) O H3CC H 3H C) BFFF F D) N H3CC H 3H H E) C H3CC H 3CH3 CH3 Ans: E Topic: Lewis Structures, Formal Charges 24. The formal charge on sulf ur in sulfuric acid is: SOOO OHH A) 0 B) -1 C) +1 D) -2 E) +2 Ans: A Topic: Lewis Structures, Formal Charges 25. ExpAns:ion of the valence sh ell to accommodate more than eight electrons is possible with: A) Fluorine B) Nitrogen C) Carbon D) Sulfur E) Beryllium Ans: D Chapter 1 11Topic: Lewis Structures, Molecular Geometry 26. Based on VSEPR theory, which of the followi ng would have a trigonal planar shape? A) CH 3)3N B) HCN C) NH 4+ D) CH 3− E) CH 3+ Ans: E Topic: Lewis Structures, Molecular Geometry 27. VSEPR theory predicts an identical shape for all of the following, except: A) NH 3 B) H 3O+ C) BH 3 D) CH 3- E) All have the same geometry Ans: C Topic: Lewis Structures, Molecular Geometry 28. What shape does the methyl cation, CH 3+, have? A) Octahedral B) Tetrahedral C) Trigonal planar D) Linear E) Trigonal pyramidal Ans: C Chapter 1 12 Topic: Lewis Structures, Molecular Geometry 29. Which of the structures below would be trigona l planar (a planar tr iangle)? (Electrical charges have been deliberately omitted.) F F II I I I IF F IVHH HB : F.. ..:.. .. H : O : HH : C : F : N :.. ..:.. .. .. .... .. A) I B) II C) III D) IV E) I and IV Ans: A Topic: Lewis Structures, Molecular Geometry 30. Which of the following would have a tr igonal planar (or tr iangular) structure? II I I I I IV V: CH3 : CH3 : NH3 : OH3 BH3 A) I, II, and IV B) II and IV C) IV D) II, IV, and V E) All of these Ans: B Topic: Molecular Geometry 31. What bond angle is associated with a tetrahedral molecule? A) 120° B) 109.5 ° C) 180° D) 90° E) 45° Ans: B Chapter 1 13Topic: Molecular Geometry 32. What would be the spatial arrangement of the atoms of the methyl anion, :CH 3-? A) Octahedral B) Tetrahedral C) Trigonal planar D) Linear E) Trigonal pyramidal Ans: E Topic: Lewis Structures, Molecular Geometry 33. Which of these structures would be a perfectly regular tetrahedron? A) CH 3Br B) CH 2Br2 C) CHBr 3 D) CBr 4 E) More than one of these Ans: D Topic: Lewis Structures, Molecular Geometry 34. Which molecule would be linear? (In each case you should write a Lewis structure before deciding.) A) SO 2 B) HCN C) H 2O2 D) H 2S E) OF 2 Ans: B Topic: Lewis Structures, Molecular Geometry 35. The bond angles in PH 3 would be expected to be approximately: A) 60° B) 90° C) 105° D) 109° E) 120° Ans: C Chapter 1 14Topic: Periodic Propert ies, Electronegativity 36. Select the most electronegative element. A) H B) O C) N D) B E) C Ans: N Topic: Atomic Orbitals, Hybridization 37. Select the hybridi zed atomic orbital. I II III IV V A) I B) II C) III D) IV E) V Ans: C Topic: Atomic Orbitals, Hybridization 38. How many 2p atomic orbitals from boron must be mixed with a 2s atomic orbital to yield the bonding hybrid atomic orbitals in BF 3? A) 1 B) 2 C) 3 D) 4 E) 5 Ans: B Chapter 1 15Topic: Atomic Orbitals, Hybridization 39. In which molecule is the central atom sp3 hybridized? A) CH 4 B) NH 3 C) H 2O D) All of these E) None of these Ans: D Topic: Atomic Orbitals, Hybridization 40. In which of the following would you expect the central atom to be sp 3 hybridized (or approximately sp3 hybridized)? A) BH 4- B) NH 4+ C) CCl 4 D) CH 3:- E) All of these Ans: D Topic: Atomic orbitals, hybridization 41. Which compound has the shor test carbon-carbon bond(s)? A) CH 3CH 3 B) CH 2=CH 2 C) HC≡CH D) CH 3CH 2CH 3 E) All carbon-carbon bonds are the same length. Ans: C Topic: Atomic Orbitals, Hybridization 42. Which of the following contains an sp 2-hybridized carbon? A) CH 4 B) CH 3:− C) CH 3CH 3 D) CH 3+ E) HC≡CH Ans: D