Chemistry, 7e (McMurry/Fay)
Chapter 23 Connections to Organic and Biological Chemistry
23.1 Multiple-Choice Questions
1) The most important characteristic of carbon atoms for forming organic molecules is
A) ability to bond together to form long chains.
B) ability to form multiple covalent bonds.
C) use of hybrid orbitals.
D) A and B
2) Which of the following statements about properties of organic compounds is not correct?
A) Most organic compounds are not soluble in water.
B) Most organic compounds do not conduct electricity.
C) Organic compounds have higher melting and boiling points than ionic compounds.
D) Organic compounds have weak intermolecular forces.
3) Another term for alkanes is
A) alkenes.
B) alkynes.
C) saturated hydrocarbons.
D) unsaturated hydrocarbons.
4) Compounds that have the same formula but different molecular structures are called
A) isoelectronic.
B) isomers.
C) isotones.
D) isotopes.
5) Which of the following statements about isomers is false?
A) All alkanes have branched chain isomers.
B) As the number of carbon atoms increase in a compound, so do the number of possible isomers.
C) Isomers have different physical properties.
D) Isomers have the same formula but different molecular structures.
6) How many isomers are there for C5H12?
A) 3
B) 4
C) 5
D) 6
7) Which is the condensed structure of a straight-chain hydrocarbon?
A) I
B) II
C) III
D) IV
8) Which condensed structure below representing an alkane is not correct?
A) CH3CH2CH3
B)
C) CH3CH2CH2CH3
D)
9) Which of the following condensed structures represent the same molecule?
A) I and II
B) II and IV
C) III and IV
D) II and III
10) Which of the structures below are identical?
A) I and II
B) II and III
C) III and IV
D) I and IV
11) Which one of the structures below is different from the other three?
A) I
B) II
C) III
D) IV
12) Some of the products from reaction of bromine and propane are shown below. (The hydrogen atoms
are not shown in the structures.) How many are identical structures?
A) 2
B) 3
C) 4
D) All are isomers of each other.
13) When alkanes react with chlorine in the presence of ultraviolet light, chlorine atoms substitute for one
or more alkane hydrogen atoms. What is the number of different chloroalkane compounds that can be
formed by the reaction of C2H6 with chlorine?
A) 3
B) 6
C) 9
D) 12
14) Which of the following statements about cycloalkanes is true?
A) The bonds in cyclopropane and cyclobutane are weaker than other cycloalkanes.
B) Cycloalkanes are also called “acyclic” compounds.
C) Cyclopropane has 109° bond angles.
D) Most cycloalkanes are planar molecules.
15) The cycloalkane represented by a square is called ________ and has the molecular formula ________.
A) cyclopropane, C3H6
B) cyclopropane, C3H8
C) cyclobutane, C4H4
D) cyclobutane, C4H8
16) What are the C–C–C bond angles in cyclopropane and cyclohexane?
A) 60° in both molecules
B) 60° in cyclopropane and 109.5° in cyclohexane
C) 60° in cyclopropane and 120° in cyclohexane
D) 109.5° in both molecules
17) Which compound is not an isomer of the other three?
A) cyclohexane
B) 1, 2-dimethylcyclobutane
C) 1, 2-dimethylcyclopropane
D) methylcyclopentane
18) Which of the following statements is false regarding functional groups?
A) The chemical properties of the functional group dictate the chemistry of the larger molecule.
B) Each functional group has a characteristic chemical behavior.
C) A functional group consists of an atom or a group of atoms that is part of a larger molecule.
D) A functional group consists of only carbon and hydrogen atoms.
19) Identify the functional group:
A) alcohol
B) amine
C) amide
D) ester
20) Identify the functional group:
A) aldehyde
B) ketone
C) ester
D) ether
21) Which functional group below represents a carboxylic acid?
A)
B)
C)
D)
22) Which functional group below represents a ketone?
A)
B)
C)
D)
23) Which functional group below represents an aldehyde?
A)
B)
C)
D)
24) The functional groups in the molecule below are
H2NCH2CO2H
A) alkane, amide, and carboxylic acid.
B) alkane, amine, and carboxylic acid.
C) alkane, amide, ketone, and alcohol.
D) alkane, amine, ketone, and alcohol.
25) The functional groups in the molecule below are
O O
HCCH2COCH3
A) alkane, aldehyde, and ester.
B) alkane, aldehyde, ketone, and ether.
C) alkane, carboxylic acid, and ester.
D) alkane, ketone, and ester.
26) Which of the following compounds is most soluble in water?
A) decanol
B) dimethyl ether
C) ethane
D) ethanol
27) How many ether isomers have the formula C4H10O?
A) 2
B) 3
C) 4
D) 5
28) What type of compound contains the –NH2 functional group?
A) alcohol
B) amine
C) carboxylic acid
D) ether
29) The C-C=O bond angle in acetic acid, shown below, is closest to
O
CH3C–OH
A) 90°.
B) 109.5°.
C) 120°.
D) 180°.
30) The H-C-H bond angles in acetic acid, shown below, are closest to
O
CH3C–OH
A) 90°.
B) 109.5°.
C) 120°.
D) 180°.
31) What is the common name for the simplest ketone, propanone?
A) acetal
B) acetone
C) carbanone
D) formalin
32) Which one of the following behaves like an acid?
A) CH3COCH3
B) (CH3)2NH
C) C2H5OH
D) C2H5COOH
33) How many grams of Ca(OH)2 are needed to neutralize 5.00 g of 3-methylbutanoic acid?
A) 1.81 g
B) 2.10 g
C) 3.63 g
D) 4.20 g
34) Which one of the following molecules is the most polar?
A) acetaldehyde
B) acetic acid
C) ethane
D) ethylene
35) Which of the functional groups below are not characterized by π bonds?
A) alkenes
B) alkynes
C) aldehydes
D) alcohols
36) Which class of hydrocarbons has the general formula CnH2n+2?
A) alkanes
B) alkenes
C) alkynes
D) cylcloalkanes
37) Which statement below is false concerning nomenclature rules for alkanes?
A) Carbon atoms are numbered starting with the atom farthest from the branching point.
B) Each branching group is assigned a number referring to its point of attachment in the parent chain.
C) The name of the alkane is written as a single word.
D) The parent name is taken from the longest continuous chain of carbon atoms.
38) An alkyl group is named for the part of the alkane group that remains after a ________ is removed.
A) C atom
B) CH3 group
C) CH2 group
D) H atom
39) If the point of attachment to an alkane is by the middle carbon in a propyl group, the group is called
A) isopropyl.
B) n-propyl.
C) sec-propyl.
D) tert-propyl.
40) What is the name for this alkyl group?
A) isobutyl
B) tert-butyl
C) tributyl
D) trimethyl
41) The following structure represents a butyl group.
A) normal
B) secondary
C) tertiary
D) quaternary
42) What is the IUPAC name for the following compound?
A) heptane
B) 3, 3-dimethylpentane
C) 2, 2-dimethyl-2-ethylpropane
D) 2, 2-diethylpropane
43) What is the IUPAC name for the following compound?
A) 1, 3-dimethyl-1-ethylhexane
B) 4, 6-dimethyl-6-ethylhexane
C) 3, 5-dimethyloctane
D) sec-hexylbutane
44) Which of the following compounds is 5-ethyl-4-isopropyl-2-methylnonane?
A)
B)
C)
D)
45) Which name is not correct?
A) 1, 2-dichloropentane
B) 2, 3-dimethylbutane
C) 2-ethylbutane
D) 4-propylheptane
46) The names of compounds with carbon-carbon double bonds contain the suffix
A) -ane.
B) -ene.
C) -yne.
D) -one.
47) What class of hydrocarbons has the general formula CnH2n?
A) alkanes
B) alkenes and cycloalkanes
C) alkynes
D) aromatics
48) What is the hybridization of the carbon in (CH3)2C*=CHC N indicated by the asterisk (*)?
A) sp
B) sp2
C) sp3
D) dsp3
49) What is the molecular geometry around the carbon in (CH3)2C=CHC* N indicated by the
asterisk (*)?
A) linear
B) trigonal planar
C) trigonal pyramidal
D) tetrahedral
50) Which of the molecules shown below are unsaturated?
(1) CH3CH2CH2CH(CH3)2
(2) CH3CH=CHCH(CH3)2
(3) HC CCH2CH(CH3)2
A) All are unsaturated.
B) Only (2) and (3) are unsaturated.
C) Only (2) is unsaturated.
D) Only (3) is unsaturated.
51) How many geometrical and structural isomers are there of butene?
A) 3
B) 4
C) 5
D) 6
52) Which of the following is trans-2-butene? (Only bonds are shown in the skeletal structures below; the
carbon and hydrogen atoms are deleted.)
A) structure a
B) structure b
C) structure c
D) none of these
53) What is the name of the following structure?
A) cis-1-ethyl-2-chloroethane
B) cis-1-chloro-1-butene
C) trans-1-chloro-1-butene
D) trans-1-chloro-2-ethylethane
54) What is the name of the following structure?
A) tert-butylethyne
B) 3, 3-dimethyl-1-pentyne
C) 3-ethyl-3-methyl-1-butyne
D) trans-ethylmethylbutyne
55) The most important synthetic chemical reactions that alkenes and alkynes undergo are called
A) addition reactions.
B) combustion reactions.
C) photochemical halogenation reactions.
D) substitution reactions.
56) Name the product of hydrogenation of trans-2-pentene.
A) pentane
B) cis-2-pentene
C) trans-2-pentane
D) none of these