Question 1

Tetracyanoethylene has the skeleton shown here: 2 hybridized? A)  2 B)  4 C)  10 D)  8 E)  6" class="answers-bank-image d-inline" rel="preload" > From its Lewis structure, determine the following.
-How many of the atoms are sp2 hybridized?

Accepted Answer

A)   2
B)   4
C)   10
D)   8
E)   6

Question 2

Consider the following molecule. (Lone pairs are not drawn in.)  2 B)  d2sp3 C)  sp D)  sp3 E)  dsp3" class="answers-bank-image d-inline" rel="preload" >
-What is the hybridization of the nitrogen atom?

Accepted Answer

A)   sp2
B)   d2sp3
C)   sp
D)   sp3
E)   dsp3

Question 3

What is the hybridization of the S atom in the molecule SO3?

Accepted Answer

A)   sp2
B)   d2sp3
C)   sp
D)   sp3
E)   dsp3

Question 4

Of the following homonuclear diatomic molecules, which is paramagnetic?

Accepted Answer

A)   C2
B)   B2
C)   F2
D)   N2
E)   None of the above

Question 5

Which of the following statements is false?

Accepted Answer

A)   Paramagnetic molecules are attracted toward a magnetic field.
B)   Paramagnetism cannot be deduced from the Lewis structure of a molecule alone.
C)   Atoms or molecules with an even number of electrons are diamagnetic.
D)   N2 molecules are diamagnetic.
E)   Atoms or molecules with an odd number of electrons are paramagnetic.

Question 6

According to MO theory, which molecule(s)  do not exist?

Accepted Answer

A)   H 
B)   H 
C)   H 
D)   H 
E)   A, B, and D

Question 7

Consider the molecular-orbital energy-level diagrams for O2 and NO. Which of the following is true?
I. Both molecules are paramagnetic.
II. The bond strength of O2 is greater than the bond strength of NO.
III. NO is an example of a homonuclear diatomic molecule.
IV. The ionization energy of NO is smaller than the ionization energy of NO+.

Accepted Answer

A)   I and II only
B)   I, II, and IV
C)   I and IV
D)   II and III
E)   I only

Question 8

How many electrons are involved in pi bonding in benzene, C6H6?

Accepted Answer

A)   18
B)   6
C)   30
D)   3
E)   12

Question 9

Which of the following statements is/are true of bond order?
1)  If the number of bonding electrons is greater than the number of antibonding electrons in a given molecule, the molecule is predicted to be stable.
2)  Bond order is the difference between the number of bonding electrons and the number of antibonding electrons, divided by 4.
3)  If the bond order of a molecule is high, its bond strength is also high.

Accepted Answer

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

Question 10

Which of the following species is paramagnetic?

Accepted Answer

A)   N2
B)   H2
C)   C2
D)   B2
E)   none of these

Question 11

Consider the structure of glycine, the simplest amino acid:  What is the total number of π bonds in the molecule?

Accepted Answer

A)   0
B)   1
C)   2
D)   1/2
E)   More information is needed.

Question 12

An ethyl group (CH3CH2-)  that is attached to a substituent that does not contain a hydrogen atom appears as what in a NMR spectrum?

Accepted Answer

A)   a triplet and a quartet with relative intensities of 3 and 2, respectively
B)   a triplet and a quartet with relative intensities of 2 and 3, respectively
C)   a doublet and a triplet with relative intensities of 2 and 3, respectively
D)   a doublet and a triplet with relative intensities of 3 and 2, respectively
E)   none of these

Question 13

Which of the following statements is false?

Accepted Answer

A)   The carbon-carbon bond in C22- is shorter than the one in CH3CH3.
B)   The carbon-carbon bond in C22- is stronger than the one in CH3CH3.
C)   C2 is diamagnetic.
D)   C2 is paramagnetic.
E)   Two of these statements are false.

Question 14

Which of the following electron distributions among the molecular orbitals best describes the NO molecule?

Accepted Answer

A)   IV
B)   V
C)   III
D)   I
E)   II

Question 15

What is the hybridization of the I atom in the molecule IF5?

Accepted Answer

A)   sp
B)   sp3
C)   dsp3
D)   sp2
E)   d2sp3

Question 16

As the bond order of a bond increases, its bond energy ______ and its bond length ______.

Accepted Answer

A)   decreases, increases
B)   increases, increases
C)   increases, decreases
D)   decreases, decreases

Question 17

What is the hybridization of the central atom in IBr4?

Accepted Answer

A)   sp2
B)   d2sp3
C)   dsp3
D)   sp
E)   sp3

Question 18

Which of the following statements is true?

Accepted Answer

A)   All antibonding MOs are higher in energy than the atomic orbitals of which they are composed.
B)   Electrons are never found in an antibonding MO.
C)   Antibonding MOs have electron density mainly outside the space between the two nuclei.
D)   None of these statements is true.
E)   Two of these statements are true.

Question 19

Consider the structure of glycine, the simplest amino acid:  What is the total number of bonds in the molecule?

Accepted Answer

A)   10
B)   11
C)   7
D)   6
E)   8

Question 20

The fact that O2 is paramagnetic can be explained by

Accepted Answer

A)   hybridization of atomic orbitals in O2.
B)   the Lewis structure of O2.
C)   the molecular-orbital diagram for O2.
D)   resonance.
E)   a violation of the octet rule.

Exam 14: Covalent Bonding: Orbitals

What is the hybridization of the S atom in the molecule SO₃?

Correct Answer
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Which of the following electron distributions among the molecular orbitals best describes the NO molecule?

Correct Answer
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As the bond order of a bond increases, its bond energy and its bond length .

Correct Answer
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An ethyl group (CH₃CH₂^-) that is attached to a substituent that does not contain a hydrogen atom appears as what in a NMR spectrum?

Correct Answer
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The fact that O₂ is paramagnetic can be explained by

Correct Answer
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Which of the following statements is false?

Correct Answer
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Consider the structure of glycine, the simplest amino acid: What is the total number of bonds in the molecule?

Correct Answer
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According to MO theory, which molecule(s) do not exist?

Correct Answer
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Correct Answer
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Tetracyanoethylene has the skeleton shown here: From its Lewis structure, determine the following. -How many of the atoms are sp² hybridized?

Correct Answer
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What is the hybridization of the central atom in IBr₄?

Correct Answer
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How many electrons are involved in pi bonding in benzene, C₆H₆?

Correct Answer
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Of the following homonuclear diatomic molecules, which is paramagnetic?

Correct Answer
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Consider the structure of glycine, the simplest amino acid: What is the total number of π bonds in the molecule?

Correct Answer
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Consider the following molecule. (Lone pairs are not drawn in.) -What is the hybridization of the nitrogen atom?

Correct Answer
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Which of the following statements is true?

Correct Answer
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Correct Answer
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Which of the following species is paramagnetic?

Correct Answer
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Which of the following statements is false?

Correct Answer
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What is the hybridization of the I atom in the molecule IF₅?

Correct Answer
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Exam 14: Covalent Bonding: Orbitals

What is the hybridization of the S atom in the molecule SO3?

Correct AnswerverifiedShow Answer

Which of the following electron distributions among the molecular orbitals best describes the NO molecule?

Correct AnswerverifiedShow Answer

As the bond order of a bond increases, its bond energy ______ and its bond length ______.

Correct AnswerverifiedShow Answer

An ethyl group (CH3CH2-) that is attached to a substituent that does not contain a hydrogen atom appears as what in a NMR spectrum?

Correct AnswerverifiedShow Answer

The fact that O2 is paramagnetic can be explained by

Correct AnswerverifiedShow Answer

Which of the following statements is false?

Correct AnswerverifiedShow Answer

Consider the structure of glycine, the simplest amino acid: What is the total number of bonds in the molecule?

Correct AnswerverifiedShow Answer

According to MO theory, which molecule(s) do not exist?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Tetracyanoethylene has the skeleton shown here: From its Lewis structure, determine the following. -How many of the atoms are sp2 hybridized?

Correct AnswerverifiedShow Answer

What is the hybridization of the central atom in IBr4?

Correct AnswerverifiedShow Answer

How many electrons are involved in pi bonding in benzene, C6H6?

Correct AnswerverifiedShow Answer

Of the following homonuclear diatomic molecules, which is paramagnetic?

Correct AnswerverifiedShow Answer

Consider the structure of glycine, the simplest amino acid: What is the total number of π bonds in the molecule?

Correct AnswerverifiedShow Answer

Consider the following molecule. (Lone pairs are not drawn in.) -What is the hybridization of the nitrogen atom?

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following species is paramagnetic?

Correct AnswerverifiedShow Answer

Which of the following statements is false?

Correct AnswerverifiedShow Answer

What is the hybridization of the I atom in the molecule IF5?

Correct AnswerverifiedShow Answer

What is the hybridization of the S atom in the molecule SO₃?

Correct Answer
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Correct Answer
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As the bond order of a bond increases, its bond energy and its bond length .

Correct Answer
verified

An ethyl group (CH₃CH₂^-) that is attached to a substituent that does not contain a hydrogen atom appears as what in a NMR spectrum?

Correct Answer
verified

The fact that O₂ is paramagnetic can be explained by

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Tetracyanoethylene has the skeleton shown here: From its Lewis structure, determine the following. -How many of the atoms are sp² hybridized?

Correct Answer
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What is the hybridization of the central atom in IBr₄?

Correct Answer
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How many electrons are involved in pi bonding in benzene, C₆H₆?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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What is the hybridization of the I atom in the molecule IF₅?

Correct Answer
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