Question 1

How many sigma 1s-2sp3 bonds are there in ethane?

Accepted Answer

A)  7 
B)  6 
C)  5 
D)  3 
E)  1 
A)  7 
B)  6 
C)  5 
D)  3 
E)  1

Question 2

Which molecule has the shortest carbon-carbon single bond?

Accepted Answer

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

Question 3

Consider the following: CH3CH2CH=CHCH2CH3
CH3CH2CH2CH2CH=CH2
I
II
CH3CH=CHCH2CH2CH3
CH2=CHCH2CH2CH2CH3
III
IV
Which two structures represent the same compound?

Accepted Answer

A)  I and II 
B)  II and III 
C)  I and III 
D)  II and IV 
E)  None of these 
A)  I and II 
B)  II and III 
C)  I and III 
D)  II and IV 
E)  None of these

Question 4

Listed below are electron dot formulas for several simple molecules and ions.All valence electrons are shown;however,electrical charges have been omitted deliberately.   Which of the structures actually bear(s)a positive charge?

Accepted Answer

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

Question 5

Which of the following is the Lewis structure for CH3CH2O2H?

Accepted Answer

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

Question 6

Which compound is not a constitutional isomer of the others?

Accepted Answer

A)  I and II 
B)  II 
C)  III 
D)  IV and V 
E)  All of the above are isomers of each other. 
A)  I and II 
B)  II 
C)  III 
D)  IV and V 
E)  All of the above are isomers of each other.

Question 7

What is the approximate hybridization state of the nitrogen atom in trimethylamine, (CH3)3N?

Accepted Answer

A)  sp 
B)  sp2 
C)  sp3 
D)  p3 
E)  d2sp3 
A)  sp 
B)  sp2 
C)  sp3 
D)  p3 
E)  d2sp3

Question 8

What point on the potential energy diagram below represents the most stable state for the hydrogen molecule?

Accepted Answer

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

Question 9

In which of these cases does the central atom have a zero formal charge?

Accepted Answer

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

Question 10

Which of these structures would be a perfectly regular tetrahedron?

Accepted Answer

A)  CH3Br 
B)  CH2Br2 
C)  CHBr3 
D)  CBr4 
E)  More than one of these 
A)  CH3Br 
B)  CH2Br2 
C)  CHBr3 
D)  CBr4 
E)  More than one of these

Question 11

When the 1s orbitals of two hydrogen atoms combine to form a hydrogen molecule,how many molecular orbitals are formed?

Accepted Answer

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

Question 12

Based on VSEPR theory,which of the following would have a trigonal planar shape?

Accepted Answer

A)  (CH3)3N 
B)  HCN 
C)  NH4+ 
D)  CH3 - 
E)  CH3+ 
A)  (CH3)3N 
B)  HCN 
C)  NH4+ 
D)  CH3 - 
E)  CH3+

Question 13

VSEPR theory predicts an identical shape for all of the following,except:

Accepted Answer

A)  NH3 
B)  H3O+ 
C)  BH3 
D)  CH3- 
E)  All have the same geometry. 
A)  NH3 
B)  H3O+ 
C)  BH3 
D)  CH3- 
E)  All have the same geometry.

Question 14

Which of the following species exhibits resonance stabilization?

Accepted Answer

A)  H2SO4 
B)  O3 
C)  CO2 
D)  CCl4 
E)  None of the species above exhibit resonance. 
A)  H2SO4 
B)  O3 
C)  CO2 
D)  CCl4 
E)  None of the species above exhibit resonance.

Question 15

CH3CH2OCH2CH3 and CH3CH2CH2CH2OH are examples of what are now termed:

Accepted Answer

A)  Structural isomers 
B)  Resonance structures 
C)  Functional isomers 
D)  Empirical isomers 
E)  Constitutional isomers 
A)  Structural isomers 
B)  Resonance structures 
C)  Functional isomers 
D)  Empirical isomers 
E)  Constitutional isomers

Question 16

Which of the following is the Lewis structure for CH3CO2H?

Accepted Answer

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

Question 17

Which of the following represent pairs of constitutional isomers?

Accepted Answer

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

Question 18

What is the formal charge on oxygen in the following structure?

Accepted Answer

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

Question 19

The modern definition of organic chemistry is _________________.

Accepted Answer

the study

Question 20

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.

Exam 1: Carbon Compounds and Chemical Bonds

How many sigma 1s-2sp3 bonds are there in ethane?

Which molecule has the shortest carbon-carbon single bond?

Consider the following: CH3CH2CH=CHCH2CH3 CH3CH2CH2CH2CH=CH2 I II CH3CH=CHCH2CH2CH3 CH2=CHCH2CH2CH2CH3 III IV Which two structures represent the same compound?

Listed below are electron dot formulas for several simple molecules and ions.All valence electrons are shown;however,electrical charges have been omitted deliberately. Which of the structures actually bear(s)a positive charge?

Which of the following is the Lewis structure for CH3CH2O2H?

Which compound is not a constitutional isomer of the others?

What is the approximate hybridization state of the nitrogen atom in trimethylamine, (CH3)3N?

What point on the potential energy diagram below represents the most stable state for the hydrogen molecule?

In which of these cases does the central atom have a zero formal charge?

Which of these structures would be a perfectly regular tetrahedron?

When the 1s orbitals of two hydrogen atoms combine to form a hydrogen molecule,how many molecular orbitals are formed?

Based on VSEPR theory,which of the following would have a trigonal planar shape?

VSEPR theory predicts an identical shape for all of the following,except:

Which of the following species exhibits resonance stabilization?

CH3CH2OCH2CH3 and CH3CH2CH2CH2OH are examples of what are now termed:

Which of the following is the Lewis structure for CH3CO2H?

Which of the following represent pairs of constitutional isomers?

What is the formal charge on oxygen in the following structure?

The modern definition of organic chemistry is _________________.

Which of the following species contributes more to the overall hybrid for 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

How many sigma 1s-2sp³ bonds are there in ethane?

Consider the following: CH₃CH₂CH=CHCH₂CH₃ CH₃CH₂CH₂CH₂CH=CH₂ I II CH₃CH=CHCH₂CH₂CH₃ CH₂=CHCH₂CH₂CH₂CH₃ III IV Which two structures represent the same compound?

Which of the following is the Lewis structure for CH₃CH₂O₂H?

What is the approximate hybridization state of the nitrogen atom in trimethylamine, (CH₃)₃N?

CH₃CH₂OCH₂CH₃ and CH₃CH₂CH₂CH₂OH are examples of what are now termed:

Which of the following is the Lewis structure for CH₃CO₂H?