Question 1

Which of the following pair does not represent resonance structures?

Accepted Answer

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

Question 2

Which of the following is the appropriate conversion of (CH3)4C to a skeletal structure?

Accepted Answer

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

Question 3

What is the hybridization for each of the indicated atoms in the following compound?

Accepted Answer

A) I = sp2; II = sp2; III = sp2. 
B) I = sp2; II = sp3; III = sp3. 
C) I = sp; II = sp2; III = sp3. 
D) I = sp2; II = sp2; III = sp3. 
A) I = sp2; II = sp2; III = sp2. 
B) I = sp2; II = sp3; III = sp3. 
C) I = sp; II = sp2; III = sp3. 
D) I = sp2; II = sp2; III = sp3.

Question 4

Which of the following statements about bonding is true?

Accepted Answer

A) Covalent bonds result from the transfer of electrons from one element to another. 
B) Ionic bonds result from the transfer of electrons from a metal to a non-metal. 
C) Ionic bonds result from the sharing of electrons between two non-metals. 
D) Covalent bonds result from the sharing of electrons between two metals. 
A) Covalent bonds result from the transfer of electrons from one element to another. 
B) Ionic bonds result from the transfer of electrons from a metal to a non-metal. 
C) Ionic bonds result from the sharing of electrons between two non-metals. 
D) Covalent bonds result from the sharing of electrons between two metals.

Question 5

In which structure is the hybridization incorrect?

Accepted Answer

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

Question 6

What is the approximate bond angle for the C-C-N bond in acetonitrile,CH3CN?

Accepted Answer

A) 90° 
B) 109.5° 
C) 120° 
D) 180° 
A) 90° 
B) 109.5° 
C) 120° 
D) 180°

Question 7

Avobenzone is an active ingredient in some common sunscreens.Which of the following is the correct molecular formula for avobenzone?

Accepted Answer

A) C22O22O3 
B) C20H22O3 
C) C21H23O3 
D) C20H24O3 
A) C22O22O3 
B) C20H22O3 
C) C21H23O3 
D) C20H24O3

Question 8

Which atomic orbitals overlap to form the C-H s bonding molecular orbitals of ethane,CH3CH3?

Accepted Answer

A) Csp2 + H1s 
B) Csp3 + H1s 
C) C2p + H1s 
D) Csp + H1s 
A) Csp2 + H1s 
B) Csp3 + H1s 
C) C2p + H1s 
D) Csp + H1s

Question 9

Which of the following molecules has the smallest dipole moment?

Accepted Answer

A) CO2 
B) HCl 
C) H2O 
D) NH3 
A) CO2 
B) HCl 
C) H2O 
D) NH3

Question 10

How many constitutional isomers are there for a molecule having the molecular formula C3H8O?

Accepted Answer

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

Question 11

What is the condensed formula of the compound below?

Accepted Answer

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

Question 12

What is the approximate H-C-O bond angle in formaldehyde,H2CO?

Accepted Answer

A) 90° 
B) 109.5° 
C) 120° 
D) 180° 
A) 90° 
B) 109.5° 
C) 120° 
D) 180°

Question 13

Which of the following statements correctly describes the typical number of bonds for carbon,nitrogen,and oxygen in most neutral organic molecules?

Accepted Answer

A) Carbon forms 4 covalent bonds,nitrogen forms 2 covalent bonds,and oxygen forms 3 covalent bonds. 
B) Carbon forms 4 covalent bonds,nitrogen forms 3 covalent bonds,and oxygen forms 2 covalent bonds. 
C) Carbon forms 4 covalent bonds,nitrogen forms 5 covalent bonds,and oxygen forms 2 covalent bonds. 
D) Carbon forms 4 covalent bonds,nitrogen forms 5 covalent bonds,and oxygen forms 4 covalent bonds. 
A) Carbon forms 4 covalent bonds,nitrogen forms 2 covalent bonds,and oxygen forms 3 covalent bonds. 
B) Carbon forms 4 covalent bonds,nitrogen forms 3 covalent bonds,and oxygen forms 2 covalent bonds. 
C) Carbon forms 4 covalent bonds,nitrogen forms 5 covalent bonds,and oxygen forms 2 covalent bonds. 
D) Carbon forms 4 covalent bonds,nitrogen forms 5 covalent bonds,and oxygen forms 4 covalent bonds.

Question 14

Which of the following is a resonance structure of the compound below?

Accepted Answer

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

Question 15

What is the ground-state electronic configuration of a carbon atom?

Accepted Answer

A) 1s2,2s2,2p5 
B) 1s2,2s2,2p2 
C) 1s2,2s2,2p6 
D) 1s2,2s2,2p4 
A) 1s2,2s2,2p5 
B) 1s2,2s2,2p2 
C) 1s2,2s2,2p6 
D) 1s2,2s2,2p4

Question 16

In which of the following ions does carbon have a formal charge?

Accepted Answer

A) I 
B) II 
C) III 
D) None of these 
A) I 
B) II 
C) III 
D) None of these

Question 17

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 18

Which atomic orbitals overlap to form the carbon-carbon s bonding molecular orbital of acetylene,C2H2?

Accepted Answer

A) Csp2 + Csp2 
B) Csp + Csp 
C) Csp3 + Csp3 
D) C2p + C2p 
A) Csp2 + Csp2 
B) Csp + Csp 
C) Csp3 + Csp3 
D) C2p + C2p

Question 19

In which of the following ions does carbon have a formal charge?

Accepted Answer

A) I 
B) II 
C) III 
D) None of these 
A) I 
B) II 
C) III 
D) None of these

Question 20

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

Accepted Answer

A) 90° 
B) 109.5° 
C) 120° 
D) 180° 
A) 90° 
B) 109.5° 
C) 120° 
D) 180°

Exam 1: Structure and Bonding

Which of the following pair does not represent resonance structures?

Which of the following is the appropriate conversion of (CH3)4C to a skeletal structure?

What is the hybridization for each of the indicated atoms in the following compound?

Which of the following statements about bonding is true?

In which structure is the hybridization incorrect?

What is the approximate bond angle for the C-C-N bond in acetonitrile,CH3CN?

Avobenzone is an active ingredient in some common sunscreens.Which of the following is the correct molecular formula for avobenzone?

Which atomic orbitals overlap to form the C-H s bonding molecular orbitals of ethane,CH3CH3?

Which of the following molecules has the smallest dipole moment?

How many constitutional isomers are there for a molecule having the molecular formula C3H8O?

What is the condensed formula of the compound below?

What is the approximate H-C-O bond angle in formaldehyde,H2CO?

Which of the following statements correctly describes the typical number of bonds for carbon,nitrogen,and oxygen in most neutral organic molecules?

Which of the following is a resonance structure of the compound below?

What is the ground-state electronic configuration of a carbon atom?

In which of the following ions does carbon have a formal charge?

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

Which atomic orbitals overlap to form the carbon-carbon s bonding molecular orbital of acetylene,C2H2?

In which of the following ions does carbon have a formal charge?

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

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 Related Compounds

Alkenes and Addition Reactions

Alkynes and Synthesis

Oxidation and Reduction

Radical Reactions

Conjugation, resonance, and Dienes

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones - Nucleophilic Addition

Carboxylic Acids and the Acidity of the O-H Bond

Carboxylic Acids and Their Derivatives - Nucleophilic Acyl Substitution

Substitution Reactions of Carbonyl Compounds at the a Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond-Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Synthetic Polymers

Lipids

Molecular Ion Peaks and Fragmentation Patterns

Analyzing Molecular Motion and Infrared Spectroscopy

Organic Spectroscopy Concepts

Filters

Which of the following is the appropriate conversion of (CH₃)₄C to a skeletal structure?

What is the approximate bond angle for the C-C-N bond in acetonitrile,CH₃CN?

Which atomic orbitals overlap to form the C-H s bonding molecular orbitals of ethane,CH₃CH₃?

How many constitutional isomers are there for a molecule having the molecular formula C₃H₈O?

What is the approximate H-C-O bond angle in formaldehyde,H₂CO?

Which atomic orbitals overlap to form the carbon-carbon s bonding molecular orbital of acetylene,C₂H₂?

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