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How many sigma ( σ\sigma ) bonds and pi ( π\pi ) bonds are in carbon monoxide?


A) three σ\sigma ,zero π\pi
B) two σ\sigma ,one π\pi
C) two σ\sigma ,two π\pi
D) one σ\sigma ,two π\pi
E) one σ\sigma ,one π\pi

F) B) and D)
G) B) and E)

Correct Answer

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Diagram 9-1 The molecular orbital diagram below may be used for the following problem(s) .For oxygen and fluorine,the σ\sigma 2p orbital should be lower in energy than the π\pi 2p orbitals.However,the diagram will still yield correct bond order and magnetic behavior for these molecules. Diagram 9-1 The molecular orbital diagram below may be used for the following problem(s) .For oxygen and fluorine,the \sigma <sub>2p</sub> orbital should be lower in energy than the \pi <sub>2p</sub> orbitals.However,the diagram will still yield correct bond order and magnetic behavior for these molecules. -Refer to Diagram 9-1.According to molecular orbital theory,which of the following species will have the \underline{\text{ highest }} bond order? A) B<sub>2</sub><sup>+</sup> B) H<sub>2</sub> C) F<sub>2</sub><sup>+</sup> D) N<sub>2</sub><sup>+</sup> E) O<sub>2</sub><sup>2-</sup> -Refer to Diagram 9-1.According to molecular orbital theory,which of the following species will have the  highest ‾\underline{\text{ highest }} bond order?


A) B2+
B) H2
C) F2+
D) N2+
E) O22-

F) A) and B)
G) A) and C)

Correct Answer

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Diagram 9-1 The molecular orbital diagram below may be used for the following problem(s) .For oxygen and fluorine,the σ\sigma 2p orbital should be lower in energy than the π\pi 2p orbitals.However,the diagram will still yield correct bond order and magnetic behavior for these molecules. Diagram 9-1 The molecular orbital diagram below may be used for the following problem(s) .For oxygen and fluorine,the \sigma <sub>2p</sub> orbital should be lower in energy than the \pi <sub>2p</sub> orbitals.However,the diagram will still yield correct bond order and magnetic behavior for these molecules. -Refer to Diagram 9-1.According to molecular orbital theory,which of the following species will be paramagnetic? A) O<sub>2</sub><sup>2-</sup> B) Li<sub>2</sub> C) O<sub>2</sub><sup>-</sup> D) C<sub>2</sub> E) F<sub>2</sub> -Refer to Diagram 9-1.According to molecular orbital theory,which of the following species will be paramagnetic?


A) O22-
B) Li2
C) O2-
D) C2
E) F2

F) C) and D)
G) B) and D)

Correct Answer

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Which of the following statements concerning valence bond (VB) theory is/are CORRECT? 1) VB theory can describe molecular bonding in excited states. 2) VB theory assumes that electrons are localized between pairs of atoms. 3) VB theory predicts localized lone pairs of electrons.


A) 1 only
B) 2 only
C) 3 only
D) 2 and 3
E) 1,2,and 3

F) B) and C)
G) C) and D)

Correct Answer

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Diagram 9-1 The molecular orbital diagram below may be used for the following problem(s) .For oxygen and fluorine,the σ\sigma 2p orbital should be lower in energy than the π\pi 2p orbitals.However,the diagram will still yield correct bond order and magnetic behavior for these molecules. Diagram 9-1 The molecular orbital diagram below may be used for the following problem(s) .For oxygen and fluorine,the \sigma <sub>2p</sub> orbital should be lower in energy than the \pi <sub>2p</sub> orbitals.However,the diagram will still yield correct bond order and magnetic behavior for these molecules. -Refer to diagram 9-1.Identify the molecule with the shortest bond length. A) O<sub>2</sub> B) C<sub>2</sub> C) B<sub>2</sub> D) F<sub>2</sub> E) N<sub>2</sub> -Refer to diagram 9-1.Identify the molecule with the shortest bond length.


A) O2
B) C2
C) B2
D) F2
E) N2

F) A) and C)
G) C) and D)

Correct Answer

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Atomic orbitals combine most effectively to form molecular orbitals when


A) electrons in the orbitals have no spins.
B) electrons in the orbitals have the same spin.
C) the atoms have an equal number of valence electrons.
D) the atomic orbitals have similar energies.
E) only d-orbitals are used in bonding.

F) A) and C)
G) C) and D)

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How many sigma ( σ\sigma ) bonds and pi ( π\pi ) bonds are in the following molecule? How many sigma ( \sigma ) bonds and pi ( \pi ) bonds are in the following molecule? A) seven \sigma and three \pi B) seven \sigma and two \pi C) five \sigma and five \pi D) five \sigma and three \pi E) five \sigma and two \pi


A) seven σ\sigma and three π\pi
B) seven σ\sigma and two π\pi
C) five σ\sigma and five π\pi
D) five σ\sigma and three π\pi
E) five σ\sigma and two π\pi

F) A) and D)
G) A) and C)

Correct Answer

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Diagram 9-1 The molecular orbital diagram below may be used for the following problem(s) .For oxygen and fluorine,the σ\sigma 2p orbital should be lower in energy than the π\pi 2p orbitals.However,the diagram will still yield correct bond order and magnetic behavior for these molecules. Diagram 9-1 The molecular orbital diagram below may be used for the following problem(s) .For oxygen and fluorine,the \sigma <sub>2p</sub> orbital should be lower in energy than the \pi <sub>2p</sub> orbitals.However,the diagram will still yield correct bond order and magnetic behavior for these molecules. -Refer to Diagram 9-1.What is the molecular orbital configuration of N<sub>2</sub><sup>2+</sup>? A) [core electrons] ( \sigma <sub>2s</sub>) <sup>2</sup> ( \sigma *<sub>2s</sub>) <sup>2</sup> ( \pi <sub>2p</sub>) <sup>4</sup> ( \sigma <sub>2p</sub>) <sup>2</sup> ( \pi *<sub>2p</sub>) <sup>2</sup> B) [core electrons] ( \sigma <sub>2s</sub>) <sup>2</sup> ( \sigma *<sub>2s</sub>) <sup>2</sup> ( \pi <sub>2p</sub>) <sup>4</sup> C) [core electrons] ( \sigma <sub>2s</sub>) <sup>2</sup> ( \sigma *<sub>2s</sub>) <sup>2</sup> ( \pi <sub>2p</sub>) <sup>2</sup> ( \sigma sub>2p</sub>) <sup>2</sup> D) [core electrons] ( \sigma <sub>2s</sub>) <sup>4</sup> ( \sigma *<sub>2s</sub>) <sup>4</sup> E) [core electrons] ( \sigma <sub>2s</sub>) <sup>2</sup> ( \sigma *<sub>2s</sub>) <sup>2</sup> ( \pi <sub>2p</sub>) <sup>4</sup> ( \sigma <sub>2p</sub>) <sup>2</sup> ( \pi *<sub>2p</sub>) <sup>4</sup> -Refer to Diagram 9-1.What is the molecular orbital configuration of N22+?


A) [core electrons] ( σ\sigma 2s) 2 ( σ\sigma *2s) 2 ( π\pi 2p) 4 ( σ\sigma 2p) 2 ( π\pi *2p) 2
B) [core electrons] ( σ\sigma 2s) 2 ( σ\sigma *2s) 2 ( π\pi 2p) 4
C) [core electrons] ( σ\sigma 2s) 2 ( σ\sigma *2s) 2 ( π\pi 2p) 2 ( σ\sigma sub>2p) 2
D) [core electrons] ( σ\sigma 2s) 4 ( σ\sigma *2s) 4
E) [core electrons] ( σ\sigma 2s) 2 ( σ\sigma *2s) 2 ( π\pi 2p) 4 ( σ\sigma 2p) 2 ( π\pi *2p) 4

F) A) and E)
G) All of the above

Correct Answer

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Benzene,C6H6,consists of a six member ring of sp2 hybridized carbon atoms.Each carbon atom has one unhybridized p orbital.How many π\pi 2p bonding,antibonding,and nonbonding molecular orbitals exist for benzene?


A) Three π\pi 2p molecular orbitals exist; two bonding and one antibonding.
B) Three π\pi 2p molecular orbitals exist; one bonding,one antibonding,and one nonbonding.
C) Six π\pi 2p molecular orbitals exist; three bonding and three antibonding.
D) Six π\pi 2p molecular orbitals exist; two bonding,two nonbonding,and two antibonding.
E) Twelve π\pi 2p molecular orbitals exist; six bonding and six antibonding.

F) A) and B)
G) A) and E)

Correct Answer

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What is the molecular geometry around a central atom that is sp2 hybridized,has three sigma bonds,and one pi bond?


A) trigonal-planar
B) trigonal-pyramidal
C) bent
D) T-shaped
E) tetrahedral

F) All of the above
G) A) and C)

Correct Answer

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The hybridization of the nitrogen atom in NH4+ is _____.


A) sp
B) sp2
C) sp3
D) sp4
E) sp6

F) A) and B)
G) B) and E)

Correct Answer

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How many sigma and pi bonds are in the molecule pictured below? How many sigma and pi bonds are in the molecule pictured below? A) thirteen sigma bonds and one pi bond B) eleven sigma bonds and two pi bonds C) thirteen sigma bonds and two pi bonds D) eleven sigma bonds and five pi bonds E) five sigma bonds and eleven pi bonds


A) thirteen sigma bonds and one pi bond
B) eleven sigma bonds and two pi bonds
C) thirteen sigma bonds and two pi bonds
D) eleven sigma bonds and five pi bonds
E) five sigma bonds and eleven pi bonds

F) C) and E)
G) A) and B)

Correct Answer

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Which molecule will have the following valence molecular orbital level energy diagram? Which molecule will have the following valence molecular orbital level energy diagram? A) Li<sub>2</sub> B) Be<sub>2</sub> C) B<sub>2</sub> D) C<sub>2</sub> E) N<sub>2</sub>


A) Li2
B) Be2
C) B2
D) C2
E) N2

F) All of the above
G) D) and E)

Correct Answer

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Which of the following statements concerning molecular orbital (MO) bond theory is/are CORRECT? 1) MO theory can describe molecular bonding in excited states. 2) Molecular orbitals are obtained from the combination of atomic orbitals. 3) MO theory predicts that electrons are delocalized over the molecule through molecular orbitals.


A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1,2,and 3

F) C) and E)
G) B) and E)

Correct Answer

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Upon combustion,ethene (C2H4) is converted to carbon dioxide and water.What change in the hybridization of carbon occurs in this reaction?


A) sp to sp2
B) sp2 to sp3
C) sp3 to sp
D) sp2 to sp
E) sp3 to sp2

F) C) and D)
G) B) and C)

Correct Answer

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What is the maximum number of hybridized orbitals that can be formed by a fluorine atom?


A) 1
B) 2
C) 3
D) 4
E) 6

F) D) and E)
G) None of the above

Correct Answer

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What is the hybridization of the sulfur atom in SCl2?


A) sp
B) sp2
C) sp3
D) none

E) A) and D)
F) None of the above

Correct Answer

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What is the molecular geometry around a central atom that is sp3 hybridized and has one lone pair of electrons?


A) bent
B) linear
C) trigonal-planar
D) trigonal-pyramidal
E) tetrahedral

F) A) and E)
G) A) and D)

Correct Answer

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When an atom in a molecule or ion is described as sp3 hybridized,its electron pair geometry is


A) linear
B) triangular planar
C) triangular pyramidal
D) bent
E) tetrahedral

F) A) and B)
G) A) and C)

Correct Answer

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Diagram 9-1 The molecular orbital diagram below may be used for the following problem(s) .For oxygen and fluorine,the σ\sigma 2p orbital should be lower in energy than the π\pi 2p orbitals.However,the diagram will still yield correct bond order and magnetic behavior for these molecules. Diagram 9-1 The molecular orbital diagram below may be used for the following problem(s) .For oxygen and fluorine,the \sigma <sub>2p</sub> orbital should be lower in energy than the \pi <sub>2p</sub> orbitals.However,the diagram will still yield correct bond order and magnetic behavior for these molecules. -Refer to Diagram 9-1.What is the molecular orbital configuration of F<sub>2</sub>? A) [core electrons] ( \sigma <sub>2s</sub>) <sup>2</sup> ( \sigma *<sub>2s</sub>) <sup>2</sup> ( \pi <sub>2p</sub>) <sup>4</sup> ( \sigma <sub>2p</sub>) <sup>2</sup> ( \sigma *<sub>2p</sub>) <sup>2</sup> B) [core electrons] ( \sigma <sub>2s</sub>) <sup>2</sup> ( \sigma *<sub>2s</sub>) <sup>2</sup> ( \pi <sub>2p</sub>) <sup>2</sup> ( \sigma <sub>2p</sub>) <sup>2</sup> ( \sigma *<sub>2p</sub>) <sup>2</sup> C) [core electrons] ( \sigma <sub>2s</sub>) <sup>2</sup> ( \sigma *<sub>2s</sub>) <sup>2</sup> ( \pi <sub>2p</sub>) <sup>4</sup> ( \pi *<sub>2p</sub>) <sup>4</sup> D) [core electrons] ( \sigma <sub>2s</sub>) <sup>2</sup> ( \sigma *<sub>2s</sub>) <sup>2</sup> ( \pi <sub>2p</sub>) <sup>4</sup> ( \sigma <sub>2p</sub>) <sup>2</sup> ( \sigma *<sub>2p</sub>) <sup>6</sup> E) [core electrons] ( \sigma <sub>2s</sub>) <sup>2</sup> ( \sigma *<sub>2s</sub>) <sup>2</sup> ( \pi <sub>2p</sub>) <sup>4</sup> ( \sigma <sub>2p</sub>) <sup>2</sup> ( \pi *<sub>2p</sub>) <sup>4</sup> -Refer to Diagram 9-1.What is the molecular orbital configuration of F2?


A) [core electrons] ( σ\sigma 2s) 2 ( σ\sigma *2s) 2 ( π\pi 2p) 4 ( σ\sigma 2p) 2 ( σ\sigma *2p) 2
B) [core electrons] ( σ\sigma 2s) 2 ( σ\sigma *2s) 2 ( π\pi 2p) 2 ( σ\sigma 2p) 2 ( σ\sigma *2p) 2
C) [core electrons] ( σ\sigma 2s) 2 ( σ\sigma *2s) 2 ( π\pi 2p) 4 ( π\pi *2p) 4
D) [core electrons] ( σ\sigma 2s) 2 ( σ\sigma *2s) 2 ( π\pi 2p) 4 ( σ\sigma 2p) 2 ( σ\sigma *2p) 6
E) [core electrons] ( σ\sigma 2s) 2 ( σ\sigma *2s) 2 ( π\pi 2p) 4 ( σ\sigma 2p) 2 ( π\pi *2p) 4

F) A) and B)
G) A) and E)

Correct Answer

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