Question 1

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 B

Question 2

What is the molecular geometry around the boron atom in BH3?

Accepted Answer

A) Tetrahedral 
B) Trigonal Planar 
C) Trigonal Pyramidal 
D) Linear 
A) Tetrahedral 
B) Trigonal Planar 
C) Trigonal Pyramidal 
D) Linear B

Question 3

Consider compounds which contain both a heteroatom and a double bond.For which compound is no additional Lewis structure possible?

Accepted Answer

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

Question 4

What is the approximate value of the H-C-H bond angle in methane,CH4?

Accepted Answer

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

Question 5

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

Accepted Answer

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

Question 6

Which of the following covalent bonds has the largest dipole moment?

Accepted Answer

A) C-H 
B) C-C 
C) C-O 
D) H-F 
A) C-H 
B) C-C 
C) C-O 
D) H-F

Question 7

How many constitutional isomers are there for a molecule having the molecular formula C3H6?

Accepted Answer

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

Question 8

Follow the curved arrows to draw the second resonance structure for the ion below.

Accepted Answer

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

Question 9

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 10

What is the formal charge of carbon in carbon monoxide (CO)when drawn with a triple bond?

Accepted Answer

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

Question 11

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

Accepted Answer

A) 1s2,2s2,2p2 
B) 1s2,2s2,2p3 
C) 1s2,2s2,2p4 
D) 1s2,2s2,2p5 
A) 1s2,2s2,2p2 
B) 1s2,2s2,2p3 
C) 1s2,2s2,2p4 
D) 1s2,2s2,2p5

Question 12

What is the ground-state electronic configuration of a magnesium cation (Mg2+)?

Accepted Answer

A) 1s2,2s2,2p6 
B) 1s2,2s2,2p6,3s1 
C) 1s2,2s2,2p6,3s2 
D) 1s2,2s2,2p6,3s2,3p2 
A) 1s2,2s2,2p6 
B) 1s2,2s2,2p6,3s1 
C) 1s2,2s2,2p6,3s2 
D) 1s2,2s2,2p6,3s2,3p2

Question 13

Which molecule has the greatest difference in electronegativity (DE)between the two different elements?

Accepted Answer

A) CO2 
B) H2S 
C) NH3 
D) H2O 
A) CO2 
B) H2S 
C) NH3 
D) H2O

Question 14

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 15

Which of the following compounds has an atom with more than eight valence electrons?

Accepted Answer

A) H2CO3 
B) H2SO4 
C) H2O 
D) HBr 
A) H2CO3 
B) H2SO4 
C) H2O 
D) HBr

Question 16

Which of the following Lewis structures is correct?

Accepted Answer

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

Question 17

Which of the following molecules are constitutional isomers?

Accepted Answer

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

Question 18

Which is not an acceptable Lewis structure for the anion CH2NCO-?

Accepted Answer

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

Question 19

What 2 things will change between two resonance structures?

Accepted Answer

A) The position of multiple bonds and non-bonded electrons. 
B) The position of multiple bonds and single bonds. 
C) The placement of atoms and single bonds. 
D) The placement of atoms and non-bonded electrons. 
A) The position of multiple bonds and non-bonded electrons. 
B) The position of multiple bonds and single bonds. 
C) The placement of atoms and single bonds. 
D) The placement of atoms and non-bonded electrons.

Question 20

Which of the following is the appropriate conversion of (CH3)2CHCH2CHClCH3 to a skeletal 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 resonance structures is the least important contributor to the resonance hybrid of the formate anion,HCOO-?

What is the molecular geometry around the boron atom in BH3?

Consider compounds which contain both a heteroatom and a double bond.For which compound is no additional Lewis structure possible?

What is the approximate value of the H-C-H bond angle in methane,CH4?

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

Which of the following covalent bonds has the largest dipole moment?

How many constitutional isomers are there for a molecule having the molecular formula C3H6?

Follow the curved arrows to draw the second resonance structure for the ion below.

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

What is the formal charge of carbon in carbon monoxide (CO)when drawn with a triple bond?

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

What is the ground-state electronic configuration of a magnesium cation (Mg2+)?

Which molecule has the greatest difference in electronegativity (DE)between the two different elements?

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

Which of the following compounds has an atom with more than eight valence electrons?

Which of the following Lewis structures is correct?

Which of the following molecules are constitutional isomers?

Which is not an acceptable Lewis structure for the anion CH2NCO-?

What 2 things will change between two resonance structures?

Which of the following is the appropriate conversion of (CH3)2CHCH2CHClCH3 to a skeletal 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 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 resonance structures is the least important contributor to the resonance hybrid of the formate anion,HCOO^-?

What is the molecular geometry around the boron atom in BH₃?

What is the approximate value of the H-C-H bond angle in methane,CH₄?

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

How many constitutional isomers are there for a molecule having the molecular formula C₃H₆?

What is the ground-state electronic configuration of a magnesium cation (Mg²⁺)?

Which is not an acceptable Lewis structure for the anion CH₂NCO^-?

Which of the following is the appropriate conversion of (CH₃)₂CHCH₂CHClCH₃ to a skeletal structure?