__________________________
Class
Date
Name
ISOMERS
;fl
Section Review
Objectives
have different properties
• Explain why structural isomers
which geometric isomers are possible
• Describe the conditions under
• Identify optical isomers
Vocabulary
• asymmetric carbon
• geometric isomers
• isomers
• structural isomers
• stereolsomers
• optical isomers
• trans configuration
•
configuration
cis
Part A Completion
terms
k your understanding of the concepts and
Use this completion exercise to chec
rt
sho
,
term
a
Each blank can be completed with
that are introduced in this section
phrase, or number
1.
1
formula but different
Isomers have the same
molecular
2
isomer of
3
-d
ci)
ci,
4
-
.
.
For example, 2—methyipropane is an
2.
h different
Isomers are different compounds wit
3.
4.
.
ups around
isomers differ in the orientation of gro
double-bond configurations are
a double bond. The two possible
5
the
6
configuration and the
7
Geometric isomers are one type of
contains a carbon atom with four
which is called an
carbon are
10
9
.
The other type
different groups attached,
c
carbon. Isomers with an asymmetri
8.
9.
10.
11.
isomers.
Models of optical isomers are like
6.
7.
configuration.
8
5.
11
images, which
12.
c)
cannot be
12
)
Chapter 22 Hydrocarbon Compounds
571
_
Name
Date
Class
Part B True-False
classify each of these statements as always true, AT sometimes
true, ST, or never true, NT
13. Structural isomers are compounds with identical mole
cular structures.
14. Compounds containing double bonds have cis, trans
isomers.
15. Isomers with the atoms joined in the same order are
structural isomers.
16. A carbon with four different groups attached is an asym
metric carbon.
Part C Matching
Match each description in Column B to the correct term in Colu
mn A.
Column A
Column 8
17. isomers
a. a carbon with four different groups attached
18. structural isomers
b. configuration with substituted groups on the same
side of
the double bond
19. stereoisomers
c. isomers that differ in the concentration of grou
ps around
a double bond
20. geometric isomers
d. molecules in which the atoms are joined in the
same
order, but the arrangements of the atoms in spac
e are
different
21. trans configuration
e. compounds that have the same molecular form
ula, but
the atoms are joined in a different order
22. cis configuration
f. configuration with substituted groups on oppo
site sides
of the double bond
23. asymmetric carbon
g. pairs of molecules that differ only in the way four
different groups are arranged around a central
carbon
atom
24. optical isomers
h. compounds that have the same molecular form
ula but
different molecular structures
Part o Problems
Irzsujer the foikiwrng in the space provided.
25. Draw three structural isomers of pentane.
ae. Identify the asyinreetite carbon in this compound.
H
4
— CH
3
Cl-I
2
3
—
3
CM
2
—
C
27. Draw the cia and tmns isomers for 3-hezene.
—
1
3
Cl-I
-1