Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
222 Chemistry: Matter and Change
Solving Problems: A Chemistry Handbook
SOLVING PROBLEMS:
A CHEMISTRY HANDBOOK
CHAPTER 21
Practice Problems
7. Decide whether the structures shown in each of these pairs represent the same compound or pairs of isomers.
a.
b.
c.
8. Which of the following is NOT a structural isomer of
2-heptene?
a. 2,3-dimethyl-1-pentene
b. methylcyclohexane
c. 3-ethyl-2-hexene
d. 3-heptene
9. Draw the structures of cis-4-octene and trans-4-octene.
21.5 Aromatic Hydrocarbons and Petroleum
The hydrocarbon known as benzene consists of a ring of six carbon
atoms with six attached hydrogen atoms. The benzene ring has a
system of delocalized electrons that are shared evenly over the carbon atoms in the ring. The sharing of electrons makes benzene a
fairly stable and unreactive compound. The pictorial representation
of benzene usually omits the hydrogen atoms.
Benzene (C 6 H 6 )
CH 3
CH 3
CH 3
CH 3
CH 3 CH
CH 3 CH 3
CH 3
CH 3
CCH 2 CH 3
CH 3 CH
CH 3
CH 2 CH 3
CCH 3
CH 3 CHCH 3
CH 3 CH 2 CH 2 CH 3
CH 3