CHEM 2202-01 – Organic Chemistry 1
Chapter 1
Practice Questions
1. Chemical reactions occur as a result of___________
A.
B.
C.
D.
E.
the attraction between opposite charges.
the nucleus–nucleus interactions.
the motion of electrons.
like atoms interacting.
combining two chemicals.
Learning Objective: 1.1 Compare and contrast organic and inorganic compounds
Difficulty: Easy
Answer: C
2. From the following, identify the item which does not contain organic compounds.
A.
B.
C.
D.
E.
medicine
socks
a plant
a coin
a plastic cup
Learning Objective: 1.1 Compare and contrast organic and inorganic compounds
Difficulty: Easy
Answer: D
3. Constitutional isomers do not differ in___________.
A.
B.
C.
D.
E.
physical properties
atomic connectivity
molecular formula
name
constitution
Learning Objective: 1.2 Describe structural theory of matter, molecular formula and structural
formula
Difficulty: Easy
Answer: C
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4. What is the relationship between the following compounds?
A.
B.
C.
D.
E.
isotopes
constitutional isomers
the same structure
composed of different elements
no relationship
Learning Objective:
structural formula
Difficulty: Easy
1.2 Describe the structural theory of matter, molecular formula and
Answer: B
5. What is the relationship between the following compounds?
A.
B.
C.
D.
E.
resonance isomers
constitutional isomers
empirical isomers
There is no relationship
isotopes
Learning Objective:
structural formula.
Difficulty: Easy
1.2 Describe the structural theory of matter, molecular formula and
Answer: B
6. Carbon is considered to be___________.
A.
B.
C.
D.
E.
tetravalent
divalent
trivalent
monovalent
pentavalent
2
Learning Objective: 1.2 Describe structural theory of matter, molecular formula and structural
formula
Difficulty: Easy
Answer: A
7. Which of the following compounds are constitutional isomers of each other?
A.
B.
C.
D.
E.
I and II
III and IV
I, II and IV
II, III and IV
I, II, and III
Learning Objective: 1.2 Describe structural theory of matter, molecular formula and structural
formula.
Difficulty: Medium
Answer: E
8. Identify three constitutional isomers having the molecular formula C4H8O.
A.
B.
C.
D.
E.
I, II, and III
II, III, and IV
III, IV, and V
I, II, and IV
II, III, and V
3
Learning Objective: 1.2 Describe structural theory of matter, molecular formula and structural
formula
Difficulty: Medium
Answer: B
9. What force is NOT considered in the formation of a covalent bond?
A.
B.
C.
D.
E.
repulsion between two positively charged nuclei
force of attraction between positively charged nuclei and negatively charged electrons
repulsion between negatively charged electrons
repulsion between positively charged nuclei and negatively charged electrons
the distance between the atoms’ nuclei
Learning Objective: 1.3 Define covalent bond, valence electrons, octet rule, and lone pair
Difficulty: Easy
Answer: D
10. What is the correct Lewis dot structure for the sulfur atom, S?
A.
B.
C.
D.
E.
I
II
III
IV
V
Learning Objective: 1.3 Define covalent bond, valence electrons, octet rule, and lone pair
Difficulty: Easy
Answer: C
11. What is the correct Lewis dot structure for the carbon atom, C?
A.
B.
C.
I
II
III
4
D.
E.
IV
V
Learning Objective: 1.3 Define covalent bond, valence electrons, octet rule, and lone pair
Difficulty: Easy
Answer: E
12. What is the correct Lewis structure for the molecule shown in the box below?
A.
B.
C.
D.
E.
I
II
III
IV
V
Learning Objective: 1.3 Define covalent bond, valence electrons, octet rule, and lone pair
Difficulty: Medium
Answer: D
13. Which of the following compounds has two lone pairs on the central atom?
A.
B.
C.
D.
E.
CO2
SCl2
NF3
CS2
SO3
Learning Objective: 1.3 Define covalent bond, valence electrons, octet rule, and lone pair
Difficulty: Medium
Answer: B
5
14. What is the formal charge on oxygen in the following structure?
A.
B.
C.
D.
E.
212+
1+
0
Learning Objective: 1.4 Define formal charge and describe how formal charge is calculated
Difficulty: Easy
Answer: D
15. What is the formal charge on nitrogen in the following structure?
A.
B.
C.
D.
E.
212+
1+
0
Learning Objective: 1.4 Define formal charge and describe how formal charge is calculated
Difficulty: Easy
Answer: D
16. The bonding pattern of oxygen with a formal charge of 1– could be described
as___________.
A.
B.
C.
D.
E.
one lone pair of electrons and three single bonds
two lone pairs of electrons and two single bonds
three lone pairs of electrons, and one single bond
one lone pair of electrons, one single, and one double bond
zero lone pairs, and two single and one double bond
6
Learning Objective: 1.4 Define formal charge and describe how formal charge is calculated
Difficulty: Medium
Answer: C
17. In an ammonium ion, nitrogen has a valence of 4, and zero nonbonding electrons.
What is the correct formal charge of nitrogen with 4 covalent bonds?
A.
B.
C.
D.
E.
22+
11+
0
Learning Objective: 1.4 Define formal charge and describe how formal charge is calculated
Difficulty: Medium
Answer: D
18. What is the correct Lewis structure for the molecule in the box, including the
formal charge(s), if any?
A.
B.
C.
D.
E.
I
II
III
IV
V
Learning Objective: 1.4 Define formal charge and describe how formal charge is calculated
Difficulty: Medium
Answer: D
7
19. Which of the following bond-line structures are of the same compound?
A.
B.
C.
D.
E.
I and II
II and III
III and IV
I and III
II and IV
Learning Objective: 1.6 Demonstrate how to read and draw bond-line structures through
converting other styles of molecular representation into bond-line structures and vice versa
Difficulty: Easy
Answer: E
20. Which of the following bond-line structures represent the same compound?
A.
B.
C.
D.
E.
I and II
II and III
III and IV
I and III
II and IV
Learning Objective: 1.6 Demonstrate how to read and draw bond-line structures through
converting other styles of molecular representation into bond-line structures and vice versa
Difficulty: Easy
Answer: D
21. The electronegativity
increase___________.
A.
B.
of
elements
on
the
periodic
table
tends
to
from left to right, top to bottom
from right to left, bottom to top
8
C.
D.
E.
from left to right, bottom to top
from right to left, top to bottom
from upper right to lower left
Learning Objective: 1.5 Describe the relationship between electronegativity and covalent, polar
covalent, and ionic bonds
Difficulty: Easy
Answer: C
22. Which of the following is the least electronegative element?
A.
B.
C.
D.
E.
B
C
N
O
F
Learning Objective: 1.5 Describe the relationship between electronegativity and covalent, polar
covalent, and ionic bonds
Difficulty: Easy
Answer: A
23. Which of the following is the most electronegative element?
A.
B.
C.
D.
E.
B
C
N
O
H
Learning Objective: 1.5 Describe the relationship between electronegativity and covalent, polar
covalent, and ionic bonds
Difficulty: Easy
Answer: D
24. What is the correct order of increasing electronegativity for Rb, F and O?
A.
B.
C.
Rb < F < O
Rb < O < F
O < F < Rb
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D.
E.
F < Rb < O
O < Rb < F
Learning Objective: 1.5 Describe the relationship between electronegativity and covalent, polar
covalent, and ionic bonds
Difficulty: Easy
Answer: B
25. Which of the following series has the correct order of elements in increasing
electronegativity?
A.
B.
C.
D.
E.
C < N < B < Br
P < N < As < F
Li < B < N < F
Cl < Cs < C < Co
Be < B < Ba < Br
Learning Objective: 1.5 Describe the relationship between electronegativity and covalent, polar
covalent, and ionic bonds
Difficulty: Easy
Answer: C
26. The Cl—Cl bond is best described as___________.
A.
B.
C.
D.
E.
nonpolar covalent
polar covalent
ionic
coordinate covalent
None of these.
Learning Objective: 1.5 Describe the relationship between electronegativity and covalent, polar
covalent, and ionic bonds
Difficulty: Easy
Answer: A
27. The C—Cl bond is best described as___________.
A.
B.
C.
nonpolar covalent
polar covalent
ionic
10
D.
E.
coordinate covalent
None of these.
Learning Objective: 1.5 Describe the relationship between electronegativity and covalent, polar
covalent, and ionic bonds
Difficulty: Easy
Answer: B
28. The bond between carbon and hydrogen is best described as___________.
A.
B.
C.
D.
E.
nonpolar covalent
polar covalent
ionic
coordinate covalent
None of these.
Learning Objective: 1.5 Describe the relationship between electronegativity and covalent, polar
covalent, and ionic bonds
Difficulty: Easy
Answer: A
29. Which of the following is the correct depiction of the dipole moment for a C—F
bond?
A.
B.
C.
D.
E.
I
II
III
IV
V
Learning Objective: 1.5 Describe the relationship between electronegativity and covalent, polar
covalent, and ionic bonds
Difficulty: Easy
Answer: A
11
30. Which of the following illustrates the correct placement of partial charges for a
P—Cl bond?
A.
B.
C.
D.
E.
I
II
III
IV
V
Learning Objective: 1.5 Describe the relationship between electronegativity and covalent, polar
covalent, and ionic bonds
Difficulty: Easy
Answer: C
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