Question 1

Which of the following statements about valence electrons is true?

Accepted Answer

A)  They are the most tightly held electrons. 
B)  They do not participate in chemical reactions. 
C)  They are the outermost electrons. 
D)  They reveal the period number of a second-row element. 
A)  They are the most tightly held electrons. 
B)  They do not participate in chemical reactions. 
C)  They are the outermost electrons. 
D)  They reveal the period number of a second-row element.

Question 2

Which of the following would you expect to have ionic bonds?

Accepted Answer

A)  CO 
B)  FBr 
C)  NF3 
D)  NaCl 
A)  CO 
B)  FBr 
C)  NF3 
D)  NaCl

Question 3

Arrange the following bonds in decreasing order of ionic character, putting the most ionic first. $$\begin{array} { c c c c } 
\text { C-C } & \text { C-N } & \text { C-O } & \text { Na-O } \
\text { I } & \text { II } & \text { III } & \text { IV }
\end{array}$$

Accepted Answer

A)  I > II > III > IV 
B)  IV > II > I > III 
C)  IV > III > II > I 
D)  IV > II > III > I 
A)  I > II > III > IV 
B)  IV > II > I > III 
C)  IV > III > II > I 
D)  IV > II > III > I

Question 4

Which of the following resonance structures is the least important contributor to the resonance hybrid of the formate anion, HCOO-?

Accepted Answer

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

Question 5

Which of the following molecules has a net dipole moment of zero?

Accepted Answer

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

Question 6

Which of the following molecules does not have a net dipole moment of zero?

Accepted Answer

A)  CCl4 
B)  BF3 
C)  CO2 
D)  NH3 
A)  CCl4 
B)  BF3 
C)  CO2 
D)  NH3

Question 7

Which of the following is the appropriate conversion of (CH3)2CHOCH2CH2CH2OH to a skeletal structure?

Accepted Answer

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

Question 8

Which is more important in each pair of contributing resonance structures?

Accepted Answer

A)  II, IV, V 
B)  II, III, V 
C)  II, III, VI 
D)  I, IV, V 
A)  II, IV, V 
B)  II, III, V 
C)  II, III, VI 
D)  I, IV, V

Question 9

How many constitutional isomers are there for a molecule having the molecular formula C2H6O?

Accepted Answer

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

Question 10

Which of the following is the appropriate conversion of the condensed structure, CH3COCH3, to a Lewis structure?

Accepted Answer

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

Exam 1: Structure and Bonding

Which of the following statements about valence electrons is true?

Which of the following would you expect to have ionic bonds?

Arrange the following bonds in decreasing order of ionic character, putting the most ionic first. C-C C-N C-O Na-O I II III IV

Which of the following resonance structures is the least important contributor to the resonance hybrid of the formate anion, HCOO-?

Which of the following molecules has a net dipole moment of zero?

Which of the following molecules does not have a net dipole moment of zero?

Which of the following is the appropriate conversion of (CH3)2CHOCH2CH2CH2OH to a skeletal structure?

Which is more important in each pair of contributing resonance structures?

How many constitutional isomers are there for a molecule having the molecular formula C2H6O?

Which of the following is the appropriate conversion of the condensed structure, CH3COCH3, to a Lewis structure?

Acids and Bases

Introduction to Organic Molecules and Functional Groups

Alkanes

Stereochemistry

Understanding Organic Reactions

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols, Ethers and Epoxides

Alkenes

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Radical Reactions

Conjugation, Resonance, and Dienes

Benzene and Aromatic Compounds

Electrophilic Aromatic Substitution

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones Nucleophilic Addition

Carboxylic Acids and Derivatives

Substitution Reactions of Carbonyl Compounds at the Alpha-Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Lipids

Synthetic Polymers

Filters

Which of the following resonance structures is the least important contributor to the resonance hybrid of the formate anion, HCOO^-?

Which of the following is the appropriate conversion of (CH₃)₂CHOCH₂CH₂CH₂OH to a skeletal structure?

How many constitutional isomers are there for a molecule having the molecular formula C₂H₆O?

Which of the following is the appropriate conversion of the condensed structure, CH₃COCH₃, to a Lewis structure?