Question 1

Valence bond theory predicts that xenon will use __________ hybrid orbitals in XeOF4.

Accepted Answer

A)  sp
B)  sp 2
C)  sp 3
D)  sp 3 d
E)  sp 3 d 2F) A) and B)
G) B) and D)

Question 2

Valence bond theory explains the bonding in diatomic molecules such as HCl without resorting to the use of hybrid orbitals.

Accepted Answer

A) True 
 B)False

Question 3

One can safely assume that the 3s- and 3p-orbitals will form molecular orbitals similar to those formed when 2s- and 2p-orbitals interact. According to molecular orbital theory, what will be the bond order for the Cl2+ ion?

Accepted Answer

A)  0.5
B)  1
C)  1.5
D)  2
E)  None of these choices are correct.F) D) and E)
G) All of the above

Question 4

Valence bond theory predicts that iodine will use __________ hybrid orbitals in ICl2−.

Accepted Answer

A)  sp 2
B)  sp 3
C)  sp 3 d
D)  sp 3 d 2
E)  None of these choices are correct.F) None of the above
G) C) and E)

Question 5

For which one of the following molecules is the indicated type of hybridization not appropriate for the central atom?

Accepted Answer

A)  BeCl 2 sp 2
B)  SiH 4 sp 3
C)  BF 3 sp 2
D)  C 2H 2 sp
E)  H 2O sp 3F) C) and D)
G) None of the above

Question 6

A molecule with the formula AX3E uses __________ to form its bonds.

Accepted Answer

A)  s and p atomic orbitals
B)  sp 3 hybrid orbitals
C)  sp 2 hybrid orbitals
D)  sp hybrid orbitals
E)  sp 3 d 2 hybrid orbitalsF) A) and C)
G) A) and E)

Question 7

Select the correct statement aboutπ - bonds in valence bond theory.

Accepted Answer

A)  A π bond is stronger than a sigma bond.
B)  A π bond can hold 4 electrons, two above and two below the σ-bond axis.
C)  A carbon-carbon double bond consists of twoπ bonds.
D)  A π  bond is the same strength as a σ bond.
E)  A π  bond between two carbon atoms restricts rotation about the C-C axis.F) A) and E)
G) A) and B)

Question 8

Valence bond theory predicts that sulfur will use __________ hybrid orbitals in sulfur dioxide, SO2.

Accepted Answer

A)  sp
B)  sp 2
C)  sp 3
D)  sp 3 d
E)  sp 3 d 2F) A) and C)
G) D) and E)

Question 9

In the valence bond treatment, overlap of an s orbital on one atom with an sp3 orbital on another atom can give rise to a σ bond.

Accepted Answer

A) True 
 B)False

Question 10

Hybrid orbitals of the sp3d type occur in sets of four.

Accepted Answer

A) True 
 B)False

Question 11

Valence bond theory predicts that bromine will use __________ hybrid orbitals in BrF5.

Accepted Answer

A)  sp 2
B)  sp 3
C)  sp 3 d
D)  sp 3 d 2
E)  None of these choices are correct.F) All of the above
G) A) and B)

Question 12

Valence bond theory predicts that bromine will use __________ hybrid orbitals in BrF3.

Accepted Answer

A)  sp 2
B)  sp 3
C)  sp 3 d
D)  sp 4
E)  sp 3 d 2F) A) and E)
G) A) and D)

Question 13

In molecular orbital theory, molecules with an even number of electrons will have bond orders which are whole numbers.

Accepted Answer

A) True 
 B)False

Question 14

The nitrosonium ion, NO+, forms a number of interesting complexes with nickel, cobalt, and iron. According to molecular orbital theory, which of the following statements about NO+ is correct?

Accepted Answer

A)  NO + has a bond order of 2 and is paramagnetic.
B)  NO + has a bond order of 2 and is diamagnetic.
C)  NO + has a bond order of 3 and is paramagnetic.
D)  NO + has a bond order of 3 and is diamagnetic.
E)  None of these choices are correct.F) A) and D)
G) A) and E)

Question 15

How many sigma and pi bonds, respectively, are in the molecule below? CH3CH2CHCHCH3

Accepted Answer

A)  16, 1
B)  16, 0
C)  15, 1
D)  15, 0
E)  14, 1F) A) and D)
G) B) and D)

Question 16

A molecule with the formula AX4 uses __________ to form its bonds.

Accepted Answer

A)  sp hybrid orbitals
B)  sp 2 hybrid orbitals
C)  sp 3 hybrid orbitals
D)  sp 3 d hybrid orbitals
E)  sp 3 d 2 hybrid orbitalsF) A) and C)
G) None of the above

Question 17

Valence bond theory predicts that tin will use __________ hybrid orbitals in SnCl3−.

Accepted Answer

A)  sp
B)  sp 2
C)  sp 3
D)  sp 3 d
E)  sp 3 d 2F) None of the above
G) D) and E)

Question 18

According to valence bond theory, which of the following molecules involves sp2 hybridization of orbitals on the central atom? (central atom is bold)

Accepted Answer

A)  C 2H 2
B)  C 2H 4
C)  C 2H 6
D)  CO 2
E)  H 2 OF) D) and E)
G) A) and E)

Question 19

A molecule with the formula AX2 uses __________ to form its bonds.

Accepted Answer

A)  sp hybrid orbitals
B)  sp 2 hybrid orbitals
C)  sp 3 hybrid orbitals
D)  sp 3 d hybrid orbitals
E)  sp 3 d 2 hybrid orbitalsF) A) and E)
G) A) and B)

Question 20

In molecular orbital theory, combination of two 2p atomic orbitals may give rise to either σ orπ type molecular orbitals.

Accepted Answer

A) True 
 B)False

Exam 11: Theories of Covalent Bonding

One can safely assume that the 3s- and 3p-orbitals will form molecular orbitals similar to those formed when 2s- and 2p-orbitals interact. According to molecular orbital theory, what will be the bond order for the Cl2+ ion?

Correct AnswerverifiedShow Answer

A molecule with the formula AX2 uses __________ to form its bonds.

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In molecular orbital theory, combination of two 2p atomic orbitals may give rise to either σ orπ type molecular orbitals.

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Select the correct statement aboutπ - bonds in valence bond theory.

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Valence bond theory predicts that tin will use __________ hybrid orbitals in SnCl3−.

Correct AnswerverifiedShow Answer

The nitrosonium ion, NO+, forms a number of interesting complexes with nickel, cobalt, and iron. According to molecular orbital theory, which of the following statements about NO+ is correct?

Correct AnswerverifiedShow Answer

In molecular orbital theory, molecules with an even number of electrons will have bond orders which are whole numbers.

Correct AnswerverifiedShow Answer

Valence bond theory explains the bonding in diatomic molecules such as HCl without resorting to the use of hybrid orbitals.

Correct AnswerverifiedShow Answer

A molecule with the formula AX4 uses __________ to form its bonds.

Correct AnswerverifiedShow Answer

Valence bond theory predicts that sulfur will use __________ hybrid orbitals in sulfur dioxide, SO2.

Correct AnswerverifiedShow Answer

Valence bond theory predicts that iodine will use __________ hybrid orbitals in ICl2−.

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Valence bond theory predicts that bromine will use __________ hybrid orbitals in BrF5.

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A molecule with the formula AX3E uses __________ to form its bonds.

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According to valence bond theory, which of the following molecules involves sp2 hybridization of orbitals on the central atom? (central atom is bold)

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How many sigma and pi bonds, respectively, are in the molecule below? CH3CH2CHCHCH3

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Valence bond theory predicts that xenon will use __________ hybrid orbitals in XeOF4.

Correct AnswerverifiedShow Answer

Hybrid orbitals of the sp3d type occur in sets of four.

Correct AnswerverifiedShow Answer

In the valence bond treatment, overlap of an s orbital on one atom with an sp3 orbital on another atom can give rise to a σ bond.

Correct AnswerverifiedShow Answer

For which one of the following molecules is the indicated type of hybridization not appropriate for the central atom?

Correct AnswerverifiedShow Answer

Valence bond theory predicts that bromine will use __________ hybrid orbitals in BrF3.

Correct AnswerverifiedShow Answer

One can safely assume that the 3s- and 3p-orbitals will form molecular orbitals similar to those formed when 2s- and 2p-orbitals interact. According to molecular orbital theory, what will be the bond order for the Cl₂⁺ ion?

Correct Answer
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A molecule with the formula AX₂ uses __________ to form its bonds.

Correct Answer
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Valence bond theory predicts that tin will use __________ hybrid orbitals in SnCl₃⁻.

Correct Answer
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The nitrosonium ion, NO⁺, forms a number of interesting complexes with nickel, cobalt, and iron. According to molecular orbital theory, which of the following statements about NO⁺ is correct?

Correct Answer
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A molecule with the formula AX₄ uses __________ to form its bonds.

Correct Answer
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Valence bond theory predicts that sulfur will use __________ hybrid orbitals in sulfur dioxide, SO₂.

Correct Answer
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Valence bond theory predicts that iodine will use __________ hybrid orbitals in ICl₂⁻.

Correct Answer
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Valence bond theory predicts that bromine will use __________ hybrid orbitals in BrF₅.

Correct Answer
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A molecule with the formula AX₃E uses __________ to form its bonds.

Correct Answer
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According to valence bond theory, which of the following molecules involves sp² hybridization of orbitals on the central atom? (central atom is bold)

Correct Answer
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How many sigma and pi bonds, respectively, are in the molecule below? CH₃CH₂CHCHCH₃

Correct Answer
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Valence bond theory predicts that xenon will use __________ hybrid orbitals in XeOF₄.

Correct Answer
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Hybrid orbitals of the sp³d type occur in sets of four.

Correct Answer
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In the valence bond treatment, overlap of an s orbital on one atom with an sp³ orbital on another atom can give rise to a σ bond.

Correct Answer
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Valence bond theory predicts that bromine will use __________ hybrid orbitals in BrF₃.

Correct Answer
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