Question 1

The molecular orbital shown below is most likely of what type?

Accepted Answer

A) s bonding 
B) s antibonding 
C) p bonding 
D) p antibonding 
A) s bonding 
B) s antibonding 
C) p bonding 
D) p antibonding C

Question 2

Covalent bonding

Accepted Answer

A) involves a transfer of electrons from one atom to another. 
B) occurs when atoms share all their valence electrons. 
C) occurs when unpaired valence electrons are shared between atoms. 
D) occurs when nonvalence electrons are shared between atoms. 
E) none of these 
A) involves a transfer of electrons from one atom to another. 
B) occurs when atoms share all their valence electrons. 
C) occurs when unpaired valence electrons are shared between atoms. 
D) occurs when nonvalence electrons are shared between atoms. 
E) none of these C

Question 3

Which of the following best represents the shape of a sp3 hybrid orbital of carbon?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4 C

Question 4

Instructions: Write valid Lewis (electron-dot)structures for each formula below.Show all electrons as dots and show all nonbonding electrons.
Write:
CH3CH2OH ethanol

Accepted Answer

Question 5

In the two structures shown below,what do the positions labeled with the arrow have in common?

Accepted Answer

A) the same type of hybridization on the carbon atom 
B) the same geometry around the carbon atom 
C) the same number of hydrogen atoms bonded to the carbon atom 
D) both carbon atoms are involved in a p bond 
A) the same type of hybridization on the carbon atom 
B) the same geometry around the carbon atom 
C) the same number of hydrogen atoms bonded to the carbon atom 
D) both carbon atoms are involved in a p bond

Question 6

Draw two possible isomers of C6H6 in which all the carbon atoms are sp2 hybridized.

Accepted Answer

Question 7

According to atomic theory:

Accepted Answer

A) the nucleus is positively charged. 
B) the nucleus contains both charged and uncharged particles. 
C) the electrons contribute very little to the total mass of the atom. 
D) the electrons are located in the atomic space outside the nucleus. 
E) all of these 
A) the nucleus is positively charged. 
B) the nucleus contains both charged and uncharged particles. 
C) the electrons contribute very little to the total mass of the atom. 
D) the electrons are located in the atomic space outside the nucleus. 
E) all of these

Question 8

How many nonbonding electron pairs are in the structure shown below?

Accepted Answer

A) 2 
B) 4 
C) 6 
D) 8 
E) none of these 
A) 2 
B) 4 
C) 6 
D) 8 
E) none of these

Question 9

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

Accepted Answer

A) 0 
B) +1 
C) -1 
D) +2 
E) -2 
A) 0 
B) +1 
C) -1 
D) +2 
E) -2

Question 10

The structure of urea is shown below.Fill in any nonbonding valence electrons that are missing from the line-bond structure.

Accepted Answer

The answer of The structure of urea is shown below.Fill...

Question 11

Draw a picture showing the orbitals involved in the p-bonds of cyclopenta-1,3-diene,a commonly encountered reagent in organic synthesis.

Accepted Answer

The answer of Draw a picture showing the orbitals involved...

Question 12

Instructions: Consider the two structures below to answer the following question.
CH3CH2OH CH3OCH3
Refer to instructions.Which of the following correctly describes the structure of these compounds?

Accepted Answer

A) All carbon atoms are sp3 hybridized. 
B) All of the bonds are sigma bonds. 
C) Each oxygen atom has two nonbonding pairs of electrons. 
D) The bond angle around each oxygen atom is ideally about 109.5$\circ$. 
E) All of these 
A) All carbon atoms are sp3 hybridized. 
B) All of the bonds are sigma bonds. 
C) Each oxygen atom has two nonbonding pairs of electrons. 
D) The bond angle around each oxygen atom is ideally about 109.5$\circ$. 
E) All of these

Question 13

How many total valence electrons are represented in the following electron configuration?
1s22s22px2 2py2 2pz1 or 1s22s22p5

Accepted Answer

A) 1 
B) 3 
C) 5 
D) 7 
E) 9 
A) 1 
B) 3 
C) 5 
D) 7 
E) 9

Question 14

In drawing the Lewis structure for an organic compound,the carbon atoms should always be shown with

Accepted Answer

A) lone pairs of electrons. 
B) four single bonds. 
C) eight total electrons. 
D) a positive charge. 
E) none of these 
A) lone pairs of electrons. 
B) four single bonds. 
C) eight total electrons. 
D) a positive charge. 
E) none of these

Question 15

The molecular formula C2H4O can be converted into three-line bond (Kekulé)structures that are consistent with valence rules.Which one of the following Kekulé structures is not consistent with valence rules?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 16

What is the expected hybridization around the sulfur atom in diethyl sulfide?
CH3CH2¾S¾CH2CH3

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) The sulfur atom is not hybridized. 
A) sp 
B) sp2 
C) sp3 
D) The sulfur atom is not hybridized.

Question 17

Instructions: Propose a structure for a molecule that meets the following description.
Refer to instructions.Contains only one sp3 hybridized carbon and two sp2 hybridized carbons.

Accepted Answer

Question 18

Consider the formation of an sp2 hybrid orbital.Which of the following is true?

Accepted Answer

A) Four equivalent hybrid orbitals are produced. 
B) One s and one p atomic orbital are involved. 
C) One p atomic orbital remains unhybridized. 
D) The hybrid orbitals produced can form p bonds. 
E) none of these 
A) Four equivalent hybrid orbitals are produced. 
B) One s and one p atomic orbital are involved. 
C) One p atomic orbital remains unhybridized. 
D) The hybrid orbitals produced can form p bonds. 
E) none of these

Question 19

How many electrons are there in the valence shell of the carbon atom of a methyl anion,CH3-?

Accepted Answer

A) 5 
B) 6 
C) 7 
D) 8 
A) 5 
B) 6 
C) 7 
D) 8

Question 20

Draw the structure for CCl2F2 using solid,wedged,and dashed lines to show the tetrahedral geometry.

Accepted Answer

Exam 1: Structure and Bonding

The molecular orbital shown below is most likely of what type?

Covalent bonding

Which of the following best represents the shape of a sp3 hybrid orbital of carbon?

Instructions: Write valid Lewis (electron-dot)structures for each formula below.Show all electrons as dots and show all nonbonding electrons. Write: CH3CH2OH ethanol

In the two structures shown below,what do the positions labeled with the arrow have in common?

Draw two possible isomers of C6H6 in which all the carbon atoms are sp2 hybridized.

According to atomic theory:

How many nonbonding electron pairs are in the structure shown below?

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

The structure of urea is shown below.Fill in any nonbonding valence electrons that are missing from the line-bond structure.

Draw a picture showing the orbitals involved in the p-bonds of cyclopenta-1,3-diene,a commonly encountered reagent in organic synthesis.

Instructions: Consider the two structures below to answer the following question. CH3CH2OH CH3OCH3 Refer to instructions.Which of the following correctly describes the structure of these compounds?

How many total valence electrons are represented in the following electron configuration? 1s22s22px2 2py2 2pz1 or 1s22s22p5

In drawing the Lewis structure for an organic compound,the carbon atoms should always be shown with

The molecular formula C2H4O can be converted into three-line bond (Kekulé)structures that are consistent with valence rules.Which one of the following Kekulé structures is not consistent with valence rules?

What is the expected hybridization around the sulfur atom in diethyl sulfide? CH3CH2¾S¾CH2CH3

Instructions: Propose a structure for a molecule that meets the following description. Refer to instructions.Contains only one sp3 hybridized carbon and two sp2 hybridized carbons.

Consider the formation of an sp2 hybrid orbital.Which of the following is true?

How many electrons are there in the valence shell of the carbon atom of a methyl anion,CH3-?

Draw the structure for CCl2F2 using solid,wedged,and dashed lines to show the tetrahedral geometry.

Polar Covalent Bonds: Acids and Bases

Organic Compounds: Alkanes and Their Stereochemistry

Organic Compounds: Cycloalkanes and Their Stereochemistry

Stereochemistry at Tetrahedral Centers

An Overview of Organic Reactions

Alkenes and Alkynes

Reactions of Alkenes and Alkynes

Aromatic Compounds

Structure Determination: Mass Spectrometry,infrared Spectroscopy,and Ultraviolet Spectroscopy

Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols,phenols,and Thiols: Ethers and Sulfides

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Nitriles

Carboxylic Acid Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution and Condensation Reactions

Amines and Heterocycles

Biomolecules: Amino Acids,peptides,and Proteins

Amino Acid Metabolism

Biomolecules: Carbohydrates

Carbohydrate Metabolism

Biomolecules: Lipids and Their Metabolism

Biomolecules: Nucleic Acids and Their Metabolism

Filters

Which of the following best represents the shape of a sp³ hybrid orbital of carbon?

Instructions: Write valid Lewis (electron-dot)structures for each formula below.Show all electrons as dots and show all nonbonding electrons. Write: CH₃CH₂OH ethanol

Draw two possible isomers of C₆H₆ in which all the carbon atoms are sp² hybridized.

Instructions: Consider the two structures below to answer the following question. CH₃CH₂OH CH₃OCH₃ Refer to instructions.Which of the following correctly describes the structure of these compounds?

How many total valence electrons are represented in the following electron configuration? 1s²2s²2p_x² 2p_y² 2p_z¹ or 1s²2s²2p⁵

The molecular formula C₂H₄O can be converted into three-line bond (Kekulé)structures that are consistent with valence rules.Which one of the following Kekulé structures is not consistent with valence rules?

What is the expected hybridization around the sulfur atom in diethyl sulfide? CH₃CH₂¾S¾CH₂CH₃

Instructions: Propose a structure for a molecule that meets the following description. Refer to instructions.Contains only one sp³ hybridized carbon and two sp² hybridized carbons.

Consider the formation of an sp² hybrid orbital.Which of the following is true?

How many electrons are there in the valence shell of the carbon atom of a methyl anion,CH₃^-?

Draw the structure for CCl₂F₂ using solid,wedged,and dashed lines to show the tetrahedral geometry.