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Chapter 23 - Organic Chemistry
1. Which of the following structures is incorrect?
A)
B)
C)
D)
E)
2. Which of the following statements concerning hydrocarbons is/are correct?
1.
Saturated hydrocarbons may be cyclic or acyclic molecules.
2.
An unsaturated hydrocarbon molecule contains at least one double bond.
3.
Ethylenediamine, H2NCH2CH2NH2, is an example of a saturated hydrocarbon.
A)
1 only
B)
2 only
C)
3 only
D)
1 and 2
E)
1, 2, and 3
3. What is the molecular geometry around each carbon atom in a saturated hydrocarbon?
A)
tetrahedral
B)
trigonal planar
C)
trigonal bipyramidal
D)
linear
E)
bent
4. Which of the following molecules has the longest carbon–carbon bond distance?
A)
C6H6
B)
H2CCO
C)
H2CCH2
D)
H3CCH3
E)
HCCH
5. Which of the following is an example of a condensed formula of an alkane?
A)
C3H8
B)
C)
D)
E)
CH3CH2CH2CH3
Test Bank General Chemistry, 10th edition 3
6. Which of the following is the general formula for an alkane?
A)
CnH2n+2
B)
C2nH2n-2
C)
CnHn
D)
CnH2n
E)
none of these
7. All of the following molecules except _________ make up a homologous series.
A)
H2CH2CH2CH2CH3
B)
CH3CH2CH3
C)
CH3CH2CH2CH3
D)
CH3CH2CH2CH2CH3
E)
CH3CHCHCH3
8. Based on the three condensed structural formulas below, which of the following statements
is true?
1
2
3
A)
Formulas 2 and 3 describe enantiomers.
B)
Formulas 1 and 3 describe different compounds.
C)
Formulas 1 and 2 describe structural isomers.
D)
Formulas 1, 2, and 3 all describe the same compound.
E)
Formulas 2 and 3 describe geometric isomers.
9. How many structural isomers have the molecular formula C6H14?
A)
5
B)
2
C)
4
D)
1
E)
3
10. Which of the following statements is true concerning the two compounds 2,3-
dimethylpentane and 2,4-dimethylpentane?
A)
Because the two compounds are structural isomers, they should have the same
molecular formula.
B)
Because the two compounds are structural isomers, they should have identical
chemical properties.
C)
Because the two compounds are structural isomers, they should have identical
physical properties.
D)
Because the two compounds are enantiomers, they should rotate polarized light in
opposite directions.
E)
Because the two compounds are geometric isomers, one should be cis and the
other should be trans.
11. The compounds 2,3-dimethylbutane and 2-methylpentane are
A)
functional isomers.
B)
structural isomers.
C)
unrelated.
D)
geometric isomers.
E)
enantiomers.
12. It is possible to write at least two different structural formulas for each of the following
molecular formulas except
A)
C2HCl3.
B)
C3H7Cl.
C)
C3H6.
D)
C4H10.
E)
C2H2Cl2.
Test Bank General Chemistry, 10th edition 5
13. Four of the following compounds are structural isomers. Which one is not?
A)
B)
C)
D)
E)
14. How many hydrogen atoms are needed to complete the following hydrocarbon structure?
A)
10
B)
12
C)
8
D)
14
E)
6
15. What is the molecular formula of a cyclic alkane with 6 carbon atoms?
A)
C6 H14
B)
C6 H10
C)
C6 H16
D)
C6 H12
E)
C6 H6
Test Bank General Chemistry, 10th edition 6
16. What is the composition of crude oil?
A)
mostly unsaturated hydrocarbons having 5–12 carbons per molecule
B)
mostly hydrocarbons, but the precise composition varies widely depending on
location
C)
mostly aromatic hydrocarbons
D)
mostly saturated hydrocarbons having 5–12 carbons per molecule
E)
mostly saturated hydrocarbons having 12–20 carbons per molecule
17. Equal masses of each of the following are reacted with an excess of dioxygen. Which would
form the greatest amount of carbon dioxide?
A)
neopentane
B)
n-pentane
C)
isopentane
D)
Two of these would form equal amounts.
E)
All of these would form equal amounts.
18. Which of the following is a possible product of the chlorination of butane in the presence of
light?
A)
C4H9Cl2
B)
C4H6Cl2
C)
C4H10Cl2
D)
C4H9Cl
E)
C4H8Cl
19. Which of the following chemical equations represents a substitution reaction?
A)
C2H4 + Cl2 → ClCH2CH2Cl
B)
HCOOH + CH3OH → HCOOCH3 + H2O
C)
CH3OH + 3/2O2 → CO2 + 2H2O
D)
C2H4 + 3O2 → 2CO2 + 2H2O
E)
C2H6 + Cl2 → CH3CH2Cl + HCl
20. What is the molecular formula of a straight-chain alkene with 10 carbon atoms?
A)
C10 H18
B)
C10 H24
C)
C10 H22
D)
C10 H20
E)
C10 H10
21. What category of hydrocarbons contains a carbon–carbon double bond?
A)
cycloalkane
B)
alkyne
C)
alcohol
D)
alkane
E)
alkene
22. Which of the following best describes the bonding in ethylene, CH2=CH2?
A)
The pi electrons are localized above and below a plane defined by the carbon and
hydrogen atoms.
B)
The pi electrons are localized between the two carbons.
C)
Each carbon atom is sp2 hybridized.
D)
A and C.
E)
B and C.
23. The functional group of an alkene consists of
A)
3 bonds.
B)
1 bond and 1 bond.
C)
2 bonds and 1 bond.
D)
2 bonds.
E)
2 bonds.
Test Bank General Chemistry, 10th edition 8
24. Which of the following is a geometric isomer of the structure given below?
A)
B)
C)
D)
E)
25. Which of the following structural formulas is not an isomer of cis-2-pentene?
A)
B)
C)
D)
E)
26. How many different isomers are possible for substances having the molecular formula
C2H2F2?
A)
2
B)
4
C)
5
D)
3
E)
1
27. Which of the following alkenes is capable of forming cis-trans isomers?
A)
(CH3)2C = CH2
B)
(CH3)2C= CHF
C)
CH3CH = CH2
D)
CH3CH = CF2
E)
CHF = CHBr
28. Which of the following names may represent either a cis or a trans isomer?
A)
1-butene
B)
1,2-dibromoethene
C)
1,1,2-tribromoethene
D)
1,1-dibromoethene
E)
1-bromo-1-chloroethene
29. What is the major product upon addition of HF to propene?
A)
CH3CHFCH2F
B)
CH3CH2CH3
C)
CH3CHFCH3
D)
CH3CH2CH2F
E)
CH3CHF=CH2
30. What is the major product after addition of two HCl to propyne, CH3CCH?
A)
CH3CHClCH2Cl
B)
CH2ClCH2CH2Cl
C)
CH3CCl2CH3
D)
CH3CH2CCl2H
E)
CH3CHCl=CH2
31. What is the expected product from the reaction of 2,3-dimethyl-1-pentene with hydrogen
gas?
A)
2,2-dimethylpentane
B)
2,3-dimethylpentane
C)
3,3-dimethylpentane
D)
2-methylhexane
E)
2,3-dimethyl-2-pentene
32. What is the expected major product from the reaction of 2-methyl-2-pentene with HCl?
A)
B)
C)
D)
E)
33. What is the molecular formula of a straight-chain alkyne with 7 carbon atoms?
A)
C7H7
B)
C7H18
C)
C7H16
D)
C7H14
E)
C7H12
Test Bank General Chemistry, 10th edition 12
34. What category of hydrocarbons contains a carbon–carbon triple bond?
A)
alkane
B)
aromatic
C)
alkyne
D)
alkene
E)
cycloalkane
35. The functional group of an alkyne consists of
A)
3 bonds.
B)
2 bonds and 1 bond.
C)
3 bonds.
D)
1 bond and 2 bonds.
E)
1 bond and 1 bond.
36. What is the compound represented by the following structure?
A)
cyclohexane, C6H12
B)
cyclohexene, C6H10
C)
cyclohexatriene, C6H12
D)
benzene, C6H6
E)
cyclohexatriene, C6H9
37. Which of the following statements concerning aromatic hydrocarbons is/are correct?
1.
Benzene requires a catalyst to undergo an addition reaction with Br2.
2.
The pi electrons of benzene are delocalized over the entire carbon ring.
3.
Aromaticity leads to decreased stability relative to alkenes.
A)
1 only
B)
2 only
C)
3 only
D)
1 and 2
E)
1, 2, and 3
38. What is the purpose of the circle in the condensed formula given below?
A)
The circle represents the delocalization of the pi electrons.
B)
The circle represents the delocalization of both the sigma and pi electrons.
C)
The circle represents alternating single and double bonds in the ring.
D)
B and C.
E)
A, B, and C.
39. Which of the following reactions is a substitution reaction?
A)
C6H6 + F2 → C6H5F + HF
B)
CH2=CH2 + F2 → CH2FCH2F
C)
CH2=CH2 + HF → CH3CH2F
D)
CH2=CH2 + H2 → CH3CH3
E)
HCCH + 2F2 → CHF2CHF2
40. What is the most characteristic reaction of benzene?
A)
addition and elimination
B)
addition
C)
oxidation
D)
reduction
E)
substitution
Test Bank General Chemistry, 10th edition 14
41. What is the IUPAC name for the following compound?
A)
4-ethyl-3-methylheptane
B)
2,3-diethylhexane
C)
3-propyl-4-methylhexane
D)
4,5-diethyldecane
E)
4-ethyl-5-methylheptane
42. What is the IUPAC name for the following structural formula?
A)
1,1-dimethyl-2-ethylpropane
B)
isoheptane
C)
2-ethyl-3-methylbutane
D)
2-methyl-3-ethylbutane
E)
2,3-dimethylpentane
43. What is the IUPAC name for the molecule given below?
A)
trans-3-hexene
B)
cis-3-hexene
C)
cis-3-pentene
D)
cis-3-pentyne
E)
trans-3-hexyne
