Question 1

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

Accepted Answer

A) True 
 B)False  True

Question 2

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 3

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

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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 6

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. 
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.

Question 7

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

Question 8

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 H 
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 H

Question 9

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 10

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

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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

Question 13

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

Accepted Answer

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

Question 14

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 15

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)  sp3d2 
A)  sp 
B)  sp2 
C)  sp3 
D)  sp3d 
E)  sp3d2

Question 16

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

Question 17

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

Question 18

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. 
A)  0.5 
B)  1 
C)  1.5 
D)  2 
E)  None of these choices is correct.

Question 19

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. 
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.

Question 20

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

Exam 11: Theories of Covalent Bonding

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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?

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

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

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?

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

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.

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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

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

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

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

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

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

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

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

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

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?

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

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

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?

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.