Question 1

A carbon-carbon triple bond in a molecule may give rise to the existence of cis and trans isomers.

Accepted Answer

A) True 
 B)False  False

Question 2

A molecule with the formula AX3 uses __________ to form its bonds.

Accepted Answer

A)   sp hybrid orbitals
B)   sp2 hybrid orbitals
C)   sp3 hybrid orbitals
D)   sp3d hybrid orbitals
E)   sp3d2 hybrid orbitalsF) A) and C)
G) A) and D) B

Question 3

A carbon-carbon double bond in a molecule may give rise to the existence of cis and trans isomers.

Accepted Answer

A) True 
 B)False

Question 4

Valence bond theory predicts that iodine will use _____ hybrid orbitals in ICl2¯.

Accepted Answer

A)   sp2
B)   sp3
C)   sp3d
D)   sp3d2
E)   None of these choices is correct.F) All of the above
G) B) and E)

Question 5

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

Accepted Answer

A)   sp2
B)   sp3
C)   sp3d
D)   sp3d2
E)   None of these choices is correct.F) B) and E)
G) D) and E)

Question 6

Atoms of period 3 and beyond can undergo sp3d2 hybridization, but atoms of period 2 cannot.

Accepted Answer

A) True 
 B)False  True

Question 7

Which one, if any, of the following statements about the MO treatment of the bonding in benzene is correct?

Accepted Answer

A)   MO theory uses resonance to describe the delocalized nature of the bonding in benzene.
B)   The lowest energy pi-bonding orbital in benzene can hold up to 6 electrons.
C)   MO theory predicts that benzene should be paramagnetic.
D)   The lowest energy pi-bonding MO in benzene has two hexagonal lobes, above and below the plane of the carbon atoms.
E)   None of these choices is correct.F) C) and D)
G) A) and D)

Question 8

In the valence bond treatment, a  $\pi$bond is formed when two 2p orbitals overlap side to side.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

Select the correct statement about   π\piπ bonds in valence bond theory.

Accepted Answer

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

Question 11

A molecule with the formula AX4E2 uses _________ to form its bonds.

Accepted Answer

A)   sp hybrid orbitals
B)   sp2 hybrid orbitals
C)   sp3 hybrid orbitals
D)   sp3d hybrid orbitals
E)   sp3d2 hybrid orbitalsF) None of the above
G) A) and B)

Question 12

Valence bond theory is able to explain why molecular oxygen is paramagnetic.

Accepted Answer

A) True 
 B)False

Question 13

According to molecular orbital (MO)  theory, the 12 outermost electrons in the O2 molecule are distributed as follows:

Accepted Answer

A)   12 in bonding MOs, 0 in antibonding MOs.
B)   10 in bonding MOs, 2 in antibonding MOs.
C)   9 in bonding MOs, 3 in antibonding MOs.
D)   8 in bonding MOs, 4 in antibonding MOs.
E)   7 in bonding MOs, 5 in antibonding MOs.F) A) and C)
G) B) and D)

Question 14

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 is correct.F) B) and D)
G) C) and E)

Question 15

In molecular orbital theory, combination of two atomic orbitals produces two molecular orbitals.

Accepted Answer

A) True 
 B)False

Question 16

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$\sigma$bond.

Accepted Answer

A) True 
 B)False

Question 17

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 18

A molecule with the formula AX4E uses _________ to form its bonds.

Accepted Answer

A)   sp2 hybrid orbitals
B)   sp3 hybrid orbitals
C)   sp3d hybrid orbitals
D)   sp3d2 hybrid orbitals
E)   None of these choices is correct.F) D) and E)
G) C) and E)

Question 19

When PCl5 solidifies it forms PCl4+ cations and PCl6¯ anions. According to valence bond theory, what hybrid orbitals are used by phosphorus in the PCl4+ cations?

Accepted Answer

A)   sp
B)   sp2
C)   sp3
D)   sp3d
E)   sp3d2F) B) and E)
G) B) and C)

Question 20

According to valence bond theory, which orbitals on N and H overlap in the NH3 molecule?

Accepted Answer

A)   2p on N overlaps with 2s on H
B)   2p on N overlaps with 1s on H
C)   2s on N overlaps with 1s on H
D)   sp3 on N overlaps with sp on H
E)   sp3 on N overlaps with 1s on HF) A) and D)
G) A) and C)

Exam 11: Theories of Covalent Bonding

A carbon-carbon triple bond in a molecule may give rise to the existence of cis and trans isomers.

Correct AnswerverifiedFalse

A molecule with the formula AX3 uses __________ to form its bonds.

Correct AnswerverifiedB

A carbon-carbon double bond in a molecule may give rise to the existence of cis and trans isomers.

Correct AnswerverifiedShow Answer

Valence bond theory predicts that iodine will use _____ hybrid orbitals in ICl2¯.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Atoms of period 3 and beyond can undergo sp3d2 hybridization, but atoms of period 2 cannot.

Correct AnswerverifiedTrue

Which one, if any, of the following statements about the MO treatment of the bonding in benzene is correct?

Correct AnswerverifiedShow Answer

In the valence bond treatment, a π\piπ bond is formed when two 2p orbitals overlap side to side.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Select the correct statement about π\piπ bonds in valence bond theory.

Correct AnswerverifiedShow Answer

A molecule with the formula AX4E2 uses _________ to form its bonds.

Correct AnswerverifiedShow Answer

Valence bond theory is able to explain why molecular oxygen is paramagnetic.

Correct AnswerverifiedShow Answer

According to molecular orbital (MO) theory, the 12 outermost electrons in the O2 molecule are distributed as follows:

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 AnswerverifiedShow Answer

In molecular orbital theory, combination of two atomic orbitals produces two molecular orbitals.

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\sigmaσ bond.

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 AX4E uses _________ to form its bonds.

Correct AnswerverifiedShow Answer

When PCl5 solidifies it forms PCl4+ cations and PCl6¯ anions. According to valence bond theory, what hybrid orbitals are used by phosphorus in the PCl4+ cations?

Correct AnswerverifiedShow Answer

According to valence bond theory, which orbitals on N and H overlap in the NH3 molecule?

Correct AnswerverifiedShow Answer

Correct Answer
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False

A molecule with the formula AX₃ uses __________ to form its bonds.

Correct Answer
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B

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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Atoms of period 3 and beyond can undergo sp³d² hybridization, but atoms of period 2 cannot.

Correct Answer
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True

Correct Answer
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In the valence bond treatment, a $\pi$ bond is formed when two 2p orbitals overlap side to side.

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

Correct Answer
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Select the correct statement about $\pi$ bonds in valence bond theory.

Correct Answer
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A molecule with the formula AX₄E₂ uses _________ to form its bonds.

Correct Answer
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Correct Answer
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According to molecular orbital (MO) theory, the 12 outermost electrons in the O₂ molecule are distributed as follows:

Correct Answer
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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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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 $\sigma$ bond.

Correct Answer
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Correct Answer
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A molecule with the formula AX₄E uses _________ to form its bonds.

Correct Answer
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When PCl₅ solidifies it forms PCl₄⁺ cations and PCl₆^¯ anions. According to valence bond theory, what hybrid orbitals are used by phosphorus in the PCl₄⁺ cations?

Correct Answer
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According to valence bond theory, which orbitals on N and H overlap in the NH₃ molecule?

Correct Answer
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