Question 1

A molecule with the formula AX2 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 B)
G) D) and E) A

Question 2

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 are correct.F) A) and B)
G) C) and E)

Question 3

The lone pair of electrons on sulfur in the sulfite ion (SO32-)  is in

Accepted Answer

A)   a p orbital.
B)   an s orbital.
C)   an sp2 hybrid orbital.
D)   an sp3 hybrid orbital.
E)   none of these orbital types.F) D) and E)
G) B) and E)

Question 4

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) D) and E)
G) A) and B)

Question 5

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnF5-.

Accepted Answer

A)   sp2
B)   sp3
C)   sp3d
D)   sp3d2
E)   d2sp3F) A) and D)
G) A) and C) C

Question 6

The angles between sp2 hybrid orbitals are 109.5°.

Accepted Answer

A) True 
 B)False

Question 7

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

Question 8

According to the molecular orbital (MO)  treatment of the NO molecule, what are the bond order and the number of unpaired electrons, respectively?

Accepted Answer

A)   2, 2
B)   3, 3
C)   1, 1
D)   1.5, 2
E)   2.5, 1F) C) and D)
G) A) and C)

Question 9

According to molecular orbital theory, all diatomic molecules with an even number of electrons will be diamagnetic.

Accepted Answer

A) True 
 B)False

Question 10

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 11

According to molecular orbital theory, what is the bond order in the O2+ ion?

Accepted Answer

A)   5.5
B)   5
C)   4
D)   2.5
E)   1.5F) B) and E)
G) C) and D)

Question 12

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnCl3-.

Accepted Answer

A)   sp
B)   sp2
C)   sp3
D)   sp3d
E)   sp3d2F) All of the above
G) A) and B)

Question 13

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

Question 14

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

Accepted Answer

A)   BeCl2 sp2
B)   SiH4 sp3
C)   BF3 sp2
D)   C2H2 sp
E)   H2O sp3F) A) and E)
G) B) and C)

Question 15

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 16

Which of the following statements relating to molecular orbital (MO)  theory is incorrect?

Accepted Answer

A)   Combination of two atomic orbitals produces one bonding and one antibonding MO.
B)   A bonding MO is lower in energy than the two atomic orbitals from which it is formed.
C)   Combination of two 2p orbitals may result in either σ or  MOs.
D)   A species with a bond order of zero will not be stable.
E)   In a stable molecule having an even number of electrons, all electrons must be paired.F) C) and D)
G) None of the above

Question 17

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)   C2H2
B)   C2H4
C)   C2H6
D)   CO2
E)   H2OF) D) and E)
G) B) and D)

Question 18

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 C)

Question 19

In applying molecular orbital theory, the bond order is calculated in the same way as with Lewis structures.

Accepted Answer

A) True 
 B)False

Question 20

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 are correct.F) A) and B)
G) All of the above

Exam 11: Theories of Covalent Bonding

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

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

The lone pair of electrons on sulfur in the sulfite ion (SO32-) is in

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnF5-.

Correct AnswerverifiedC

The angles between sp2 hybrid orbitals are 109.5°.

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

According to the molecular orbital (MO) treatment of the NO molecule, what are the bond order and the number of unpaired electrons, respectively?

Correct AnswerverifiedShow Answer

According to molecular orbital theory, all diatomic molecules with an even number of electrons will be diamagnetic.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

According to molecular orbital theory, what is the bond order in the O2+ ion?

Correct AnswerverifiedShow Answer

Valence bond theory predicts that tin will use _____ hybrid orbitals in SnCl3-.

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 AnswerverifiedC

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

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

Which of the following statements relating to molecular orbital (MO) theory is incorrect?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In applying molecular orbital theory, the bond order is calculated in the same way as with Lewis structures.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answer
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A

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The lone pair of electrons on sulfur in the sulfite ion (SO₃^2-) is in

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

Correct Answer
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Valence bond theory predicts that tin will use _____ hybrid orbitals in SnF₅^-.

Correct Answer
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C

The angles between sp² hybrid orbitals are 109.5°.

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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According to molecular orbital theory, what is the bond order in the O₂⁺ ion?

Correct Answer
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Valence bond theory predicts that tin will use _____ hybrid orbitals in SnCl₃^-.

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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C

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

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

Correct Answer
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