Question 1

Which structure(s)contain(s)an oxygen that bears a formal charge of +1?

Accepted Answer

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

Question 2

Which of the following species is/are a resonance form(s)of the species in the box?

Accepted Answer

A)  I and II 
B)  I and III 
C)  III and IV 
D)  III 
E)  More than two of them are correct resonance forms. 
A)  I and II 
B)  I and III 
C)  III and IV 
D)  III 
E)  More than two of them are correct resonance forms.

Question 3

The bond angle for the C-C-N bonds in CH3CN would be expected to be approximately:

Accepted Answer

A)  90 $\degree$ 
B)  109 $\degree$ 
C)  120 $\degree$ 
D)  145 $\degree$ 
E)  180 $\degree$ 
A)  90 $\degree$ 
B)  109 $\degree$ 
C)  120 $\degree$ 
D)  145 $\degree$ 
E)  180 $\degree$

Question 4

How many s-sp3 bonds are there in the following substance?

Accepted Answer

A)  3 
B)  8 
C)  12 
D)  13 
E)  16 
A)  3 
B)  8 
C)  12 
D)  13 
E)  16

Question 5

Organic compounds were originally defined as compounds obtained from __________.

Accepted Answer

living sou

Question 6

Which is NOT a correct Lewis structure?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E)  None of these 
A) 
  
B) 
  
C) 
  
D) 
  
E)  None of these

Question 7

When the ls orbitals of two hydrogen atoms combine to form a hydrogen molecule,which molecular orbitals are formed?

Accepted Answer

A)  One bonding molecular orbital only 
B)  Two bonding molecular orbitals 
C)  One bonding molecular orbital and one antibonding molecular orbital 
D)  Two antibonding molecular orbitals 
E)  Three bonding molecular orbitals 
A)  One bonding molecular orbital only 
B)  Two bonding molecular orbitals 
C)  One bonding molecular orbital and one antibonding molecular orbital 
D)  Two antibonding molecular orbitals 
E)  Three bonding molecular orbitals

Question 8

Which of the following is a set of constitutional isomers?

Accepted Answer

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

Question 9

Which of the following species is a resonance form of the species in the box?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  None of the above are correct resonance forms. 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  None of the above are correct resonance forms.

Question 10

Which of the following species contributes more to the overall hybrid for the species in the box?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  The one in the box. 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  The one in the box.

Question 11

Which of the following pairs are NOT resonance structures?

Accepted Answer

A) 
  
B) 
  
C) 
  
D)  Each of these pairs represents resonance structures. 
E)  None of these pairs represents resonance structures. 
A) 
  
B) 
  
C) 
  
D)  Each of these pairs represents resonance structures. 
E)  None of these pairs represents resonance structures.

Question 12

What bond angle is associated with a tetrahedral molecule?

Accepted Answer

A)  120$\degree$ 
B)  109.5$\degree$ 
C)  180$\degree$ 
D)  90$\degree$ 
E)  45$\degree$ 
A)  120$\degree$ 
B)  109.5$\degree$ 
C)  180$\degree$ 
D)  90$\degree$ 
E)  45$\degree$

Question 13

The bond angle for the C-S-C bonds in the following molecule would be expected to be approximately:

Accepted Answer

A)  90 $\degree$ 
B)  109 $\degree$ 
C)  120 $\degree$ 
D)  145 $\degree$ 
E)  180 $\degree$ 
A)  90 $\degree$ 
B)  109 $\degree$ 
C)  120 $\degree$ 
D)  145 $\degree$ 
E)  180 $\degree$

Question 14

How many resonance structures can be written for the NO3- ion in which the nitrogen atom bears a formal charge of +1?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 15

The formal charge on sulfur in sulfuric acid is:

Accepted Answer

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

Question 16

Which compound has the shortest carbon-carbon bond(s)?

Accepted Answer

A)  CH3CH3 
B)  CH2=CH2 
C)  HC$ \equiv$CH 
D)  CH3CH2CH3 
E)  All carbon-carbon bonds are the same length. 
A)  CH3CH3 
B)  CH2=CH2 
C)  HC$ \equiv$CH 
D)  CH3CH2CH3 
E)  All carbon-carbon bonds are the same length.

Question 17

Which of the following molecules or ions has a nitrogen with a formal charge of -1? (Charges on ions have been omitted. )

Accepted Answer

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

Question 18

cis-trans : isomerism is possible only in the case of:

Accepted Answer

A)  CH2=CBr2 
B)  CH2=CHBr 
C)  BrCH=CHBr 
D)  Br2C=CHBr 
E)  Br2C=CBr2 
A)  CH2=CBr2 
B)  CH2=CHBr 
C)  BrCH=CHBr 
D)  Br2C=CHBr 
E)  Br2C=CBr2

Question 19

Which of the following species is/are a resonance form(s)of the species in the box?

Accepted Answer

A)  I and II 
B)  II and III 
C)  III 
D)  II 
E)  More than two of them are correct resonance forms. 
A)  I and II 
B)  II and III 
C)  III 
D)  II 
E)  More than two of them are correct resonance forms.

Question 20

Which of the following species is/are not a resonance form(s)of the species in the box?

Accepted Answer

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

Exam 1: Carbon Compounds and Chemical Bonds

Which structure(s)contain(s)an oxygen that bears a formal charge of +1?

Which of the following species is/are a resonance form(s)of the species in the box?

The bond angle for the C-C-N bonds in CH3CN would be expected to be approximately:

How many s-sp3 bonds are there in the following substance?

Organic compounds were originally defined as compounds obtained from __________.

Which is NOT a correct Lewis structure?

When the ls orbitals of two hydrogen atoms combine to form a hydrogen molecule,which molecular orbitals are formed?

Which of the following is a set of constitutional isomers?

Which of the following species is a resonance form of the species in the box?

Which of the following species contributes more to the overall hybrid for the species in the box?

Which of the following pairs are NOT resonance structures?

What bond angle is associated with a tetrahedral molecule?

The bond angle for the C-S-C bonds in the following molecule would be expected to be approximately:

How many resonance structures can be written for the NO3- ion in which the nitrogen atom bears a formal charge of +1?

The formal charge on sulfur in sulfuric acid is:

Which compound has the shortest carbon-carbon bond(s)?

Which of the following molecules or ions has a nitrogen with a formal charge of -1? (Charges on ions have been omitted. )

cis-trans : isomerism is possible only in the case of:

Which of the following species is/are a resonance form(s)of the species in the box?

Which of the following species is/are not a resonance form(s)of the species in the box?

Representative Carbon Compounds: Functional Groups, Intermolecular Forces, and Infrared Ir Spectroscopy

An Introduction to Organic Reactions: Acids and Bases

Alkanes: Nomenclature, Conformational Analysis, and an Introduction to Synthesis

Stereochemistry: Chiral Molecules

Ionic Reactions - Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Alkenes and Alkynes Ii: Addition Reactions

Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones I Nucleophilic Addition to the Carbonyl Group

Aldehydes and Ketones Ii Aldol Reactions

Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Synthesis and Reactions of Beta-Dicarbonyl Compounds: More Chemistry of Enolate Ions

Amines

Phenols and Aryl Halides: Nucleophilic Aromatic Substitution

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

The bond angle for the C-C-N bonds in CH₃CN would be expected to be approximately:

How many s-sp³ bonds are there in the following substance?

How many resonance structures can be written for the NO₃^- ion in which the nitrogen atom bears a formal charge of +1?