45669583-organic-practice

45669583-Organic-Practice
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Unformatted text preview: Chapter 1 1 MULTIPLE 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 Ψ 2 is negative. Ans: C Topic: Atomic Orbitals, Molecular Orbitals 2. When the 1 s orbitals of two hydrogen atoms combine to form a hydrogen molecule, how many molecular orbitals 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 2 Topic: Atomic Orbitals, Bonding 4. What point on the potential energy diagram below 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 theory, 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 atoms 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 3 Topic: Atomic Orbitals, Hybridization 7. The following electron configuration represents _______. 1s 2sp 3 2sp 3 2sp 3 2sp 3 A) the ground state of boron. B) the sp 3 hybridized state of carbon. C) the sp 3 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 , 2sp 2 ) B) (2sp 3 , 2sp 3 ) C) (2sp, 2sp) D) (2p, 2p) E) (2sp, 1s) Ans: C Chapter 1 4 Topic: Lewis Structures, Formal Charges 10. Listed below are electron dot formulas for several simple molecules and ions. All valence electrons are shown; however, electrical charges have been omitted deliberately. H H H H H H I II III IV V H : Be : H H : B : H H : N : H H : N : H H : O : H . . . . . . . . . . . . . . . . Which of the structures actually 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? ...
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