Question 1

Which atomic orbitals overlap to form the carbon-carbon σ and π bonding molecular orbitals of ethene, H2C=CH2?

Accepted Answer

A)   C2sp3 + C2sp3, and C2p + C2p
B)   C2sp2 + C2sp2, and C2sp2 + C2sp2
C)   C2sp2 + C2sp2, and C2p + C2p
D)   C2sp3 + C2sp3, and C2sp2 + C2sp2E) B) and C)
F) All of the above

Question 2

Which of the following bonds is a polar covalent bond?

Accepted Answer

A)   Na−F
B)   C−H
C)   C−O
D)   Cl−ClE) B) and D)
F) C) and D)

Question 3

Which of the following molecules is not linear?

Accepted Answer

A)   H2O
B)   CO2
C)   HC≡CH
D)   Cl2E) A) and B)
F) All of the above

Question 4

Draw bond-line structures of all of the tertiary (3°) alcohols that have the formula C6H14O.

Accepted Answer

Question 5

What is the approximate value of the length of the C≡C bond in ethyne, HC≡CH?

Accepted Answer

A)   121 pm
B)   134 pm
C)   142 pm
D)   154 pmE) A) and B)
F) A) and D)

Question 6

Draw bond-line structures of all of the ketones that have the formula C5H10O.

Accepted Answer

Question 7

Provide a neatly drawn figure to show the atomic orbitals that overlap to form each of the bonds in ethyne (acetylene, HC≡CH). Label each bond (e.g., C-H σ bond) and indicate which atomic orbitals contribute to this bond (e.g., C 2sp3 + H 1s).

Accepted Answer

Question 8

Circle all of the sp hybridized atoms in the following molecular structure.

Accepted Answer

The answer of Circle all of the sp hybridized atoms...

Question 9

Which of the following molecules has a molecular dipole moment?

Accepted Answer

A)   H2O
B)   CO2
C)   HC≡CH
D)   Cl2E) A) and D)
F) None of the above

Question 10

Which of the following resonance structures makes the largest contribution to the structure of [H2CCHO] −? 2CCHO] −?   A)  1 B)  2 C)  3 D)  4" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) B) and D)
F) B) and C)

Question 11

The following species forms during an organic reaction.  The formal charge on the carbon atom indicated by the arrow is +1.

Accepted Answer

A) True 
 B)False

Question 12

What is the approximate value of the length of the C=C bond in ethane, CH2=CH2?

Accepted Answer

A)   121 pm
B)   134 pm
C)   142 pm
D)   154 pmE) C) and D)
F) B) and D)

Question 13

What is the approximate C−C−C bond angle in propene, CH3CH=CH2?

Accepted Answer

A)   90°
B)   109°
C)   120°
D)   180°E) A) and B)
F) None of the above

Question 14

Which atomic orbitals overlap to form the carbon-hydrogen σ bonding molecular orbitals of ethane, CH3CH3?

Accepted Answer

A)   C2p + H1s
B)   C2sp + H1s
C)   C2sp2 + H1s
D)   C2sp3 + H1sE) A) and D)
F) B) and D)

Question 15

The energy released on the addition of an electron to an atom or a molecule is called _____.

Accepted Answer

A)   electron affinity
B)   ionization energy
C)   resonance energy
D)   delocalizationE) A) and D)
F) All of the above

Question 16

Which of the following is a secondary (2°)  amine?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) None of the above
F) A) and B)

Question 17

Which of the following molecules has a molecular dipole moment?

Accepted Answer

A)   CO2
B)   BF3
C)   NH3
D)   CH4E) All of the above
F) None of the above

Question 18

Which atomic orbitals overlap to form the C=O bond of acetone, (CH3) 2C=O?

Accepted Answer

A)   C 2sp3 + O 2sp2
B)   C 2sp2 + O 2p
C)   C 2sp2 + O 2sp2
D)   C 2sp3 + O 2spE) A) and B)
F) C) and D)

Question 19

Provide a neatly drawn figure to show the atomic orbitals that overlap to form each of the bonds in ethene (ethylene, H2C=CH2). Label each bond (e.g., C-H σ bond) and indicate which atomic orbitals contribute to this bond (e.g., C 2sp3 + H 1s).

Accepted Answer

Question 20

What is the approximate strength of the C−C bond of ethane?

Accepted Answer

A)   376 kJ/mol (90 kcal./mol) 
B)   422 kJ/mol (101 kcal./mol) 
C)   556 kJ/mol (133 kcal./mol) 
D)   727 kJ/mol (174 kcal./mol) E) A) and D)
F) None of the above

Exam 1: Covalent Bonding and Shapes of Molecules

Draw bond-line structures of all of the ketones that have the formula C5H10O.

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Provide a neatly drawn figure to show the atomic orbitals that overlap to form each of the bonds in ethene (ethylene, H2C=CH2). Label each bond (e.g., C-H σ bond) and indicate which atomic orbitals contribute to this bond (e.g., C 2sp3 + H 1s).

Correct AnswerverifiedShow Answer

The following species forms during an organic reaction. The formal charge on the carbon atom indicated by the arrow is +1.

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What is the approximate strength of the C−C bond of ethane?

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What is the approximate value of the length of the C=C bond in ethane, CH2=CH2?

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Which of the following bonds is a polar covalent bond?

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Which atomic orbitals overlap to form the carbon-carbon σ and π bonding molecular orbitals of ethene, H2C=CH2?

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The energy released on the addition of an electron to an atom or a molecule is called _____.

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Which of the following molecules has a molecular dipole moment?

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What is the approximate C−C−C bond angle in propene, CH3CH=CH2?

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Draw bond-line structures of all of the tertiary (3°) alcohols that have the formula C6H14O.

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Circle all of the sp hybridized atoms in the following molecular structure.

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Provide a neatly drawn figure to show the atomic orbitals that overlap to form each of the bonds in ethyne (acetylene, HC≡CH). Label each bond (e.g., C-H σ bond) and indicate which atomic orbitals contribute to this bond (e.g., C 2sp3 + H 1s).

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Which atomic orbitals overlap to form the carbon-hydrogen σ bonding molecular orbitals of ethane, CH3CH3?

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Which of the following resonance structures makes the largest contribution to the structure of [H2CCHO] −?

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Which of the following molecules is not linear?

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What is the approximate value of the length of the C≡C bond in ethyne, HC≡CH?

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Which atomic orbitals overlap to form the C=O bond of acetone, (CH3) 2C=O?

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Which of the following is a secondary (2°) amine?

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Which of the following molecules has a molecular dipole moment?

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Draw bond-line structures of all of the ketones that have the formula C₅H₁₀O.

Correct Answer
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Provide a neatly drawn figure to show the atomic orbitals that overlap to form each of the bonds in ethene (ethylene, H₂C=CH₂). Label each bond (e.g., C-H σ bond) and indicate which atomic orbitals contribute to this bond (e.g., C 2sp³ + H 1s).

Correct Answer
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What is the approximate value of the length of the C=C bond in ethane, CH₂=CH₂?

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Which atomic orbitals overlap to form the carbon-carbon σ and π bonding molecular orbitals of ethene, H₂C=CH₂?

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What is the approximate C−C−C bond angle in propene, CH₃CH=CH₂?

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Draw bond-line structures of all of the tertiary (3°) alcohols that have the formula C₆H₁₄O.

Correct Answer
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Correct Answer
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Provide a neatly drawn figure to show the atomic orbitals that overlap to form each of the bonds in ethyne (acetylene, HC≡CH). Label each bond (e.g., C-H σ bond) and indicate which atomic orbitals contribute to this bond (e.g., C 2sp³ + H 1s).

Correct Answer
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Which atomic orbitals overlap to form the carbon-hydrogen σ bonding molecular orbitals of ethane, CH₃CH₃?

Correct Answer
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Which of the following resonance structures makes the largest contribution to the structure of [H₂CCHO] ⁻?

Correct Answer
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Which atomic orbitals overlap to form the C=O bond of acetone, (CH₃) ₂C=O?

Correct Answer
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