Deck 23: Organic and Biological Chemistry

Question 1

Which is the condensed structure of a straight-chain hydrocarbon?

A)I
B)II
C)III
D)IV

Answer 1

I

Question 2

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

Answer 2

III and IV

Question 3

Which one of the structures below is different from the other three?

A)I
B)II
C)III
D)IV

Answer 3

I

Question 4

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.

Question 5

Compounds that have the same formula but different molecular structures are called

A)isoelectronic.
B)isomers.
C)isotones.
D)isotopes.

Question 6

Which class of hydrocarbons has the general formula C_nH_2n+2?

A)alkanes
B)alkenes
C)alkynes
D)cylcloalkanes

Question 7

Another term for alkanes is

A)alkenes.
B)alkynes.
C)saturated hydrocarbons.
D)unsaturated hydrocarbons.

Question 8

Which functional group below represents a ketone?

A)
B)
C)
D)

Question 9

Identify the functional group:

A)aldehyde
B)ketone
C)ester
D)ether

Question 10

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

Question 11

Identify the functional group:

A)alcohol
B)amine
C)amide
D)ester

Question 12

Which functional group below represents a carboxylic acid?

A)
B)
C)
D)

Question 13

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.

Question 14

Which compound is a saturated hydrocarbon?

A)benzene
B)cyclohexene
C)2-methylpentane
D)propylene

Question 15

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

Question 16

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.

Question 17

How many isomers are there for C₅H₁₂?

A)3
B)4
C)5
D)6

Question 18

Which of the structures below are identical?

A)I and II
B)II and III
C)III and IV
D)I and IV

Question 19

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.

Question 20

Which condensed structure below representing an alkane is not correct?

A)CH₃CH₂CH₃
B)
C)CH₃CH₂CH₂CH₃
D)

Question 21

Which of the following compounds is 5-ethyl-4-isopropyl-2-methylnonane?

A)
B)
C)
D)

Question 22

(CH₃)₂CH- represents a butyl group.

A)normal
B)secondary
C)tertiary
D)quaternary

Question 23

Which name is not correct?

A)2,2-dimethylbutane
B)2,3-dimethylpentane
C)2,3,3-trimethylbutane
D)2,3,3-trimethylpentane

Question 24

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

Question 25

The names of compounds with carbon-carbon double bonds contain the suffix ________.

A)-ane
B)-ene
C)-yne
D)-one

Question 26

What class of hydrocarbons has the general formula C_nH_2n?

A)alkanes
B)alkenes and cycloalkanes
C)alkynes
D)aromatics

Question 27

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.

Question 28

None of the listed compounds contains a ring.Which has at least one triply-bonded carbon atom?

A)C₂H₆
B)C₃H₄
C)C₄H₈
D)All of these

Question 29

Which name is not correct?

A)1,2-dichloropentane
B)2,3-dimethylbutane
C)2-ethylbutane
D)4-propylheptane

Question 30

None of the listed compounds contains a ring.Which has at least one doubly-bonded carbon atom?

A)C₂H₆
B)C₃H₄
C)C₄H₈
D)All of these

Question 31

Which functional group below represents an aldehyde?

A)
B)
C)
D)

Question 32

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.

Question 33

What is the IUPAC name for the continuous carbon chain of C₁₀H₂₂?

A)decane
B)dipentane
C)tenalkane
D)tenane

Question 34

What is the name for the alkyl group:

A)isobutyl
B)tert-butyl
C)tributyl
D)trimethyl

Question 35

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

Question 36

None of the listed compounds contains a ring.Which has at least one singly-bonded carbon atom?

A)C₂H₆
B)C₃H₄
C)C₄H₈
D)All of these

Question 37

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.

Question 38

Which one of the following compounds is an alcohol?

A)CH₃OCH₃
B)CH₃COCH₃
C)(CH₃)₂CHOH
D)CH₃CO₂H

Question 39

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

Question 40

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.

Question 41

Which of the following is not a geometric (cis-trans)isomer?

A)1,1-dichloro-1-butene
B)1,2-dichloro-1-butene
C)2-butene
D)2-chloro-2-butene

Question 42

In the addition reaction of water and propene in an acidic solution,the product is ________.

A)an alcohol
B)a carboxylic acid
C)an ether
D)a ketone

Question 43

Name the product obtained from the addition of bromine to 3-methyl-1-butene.

A)1,1-dibromobutane
B)1,2-dibromo-3-methylbutane
C)1,2-dibromopentane
D)trans-1,2-dibromobutene

Question 44

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.

Question 45

What is the hybridization of the carbon in (CH₃)₂C=CHCN indicated by the asterisk (*)?

A)sp
B)sp²
C)sp³
D)dsp³

Question 46

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

Question 47

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.

Question 48

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

Question 49

Which of the following is a correct name for an alkyne?

A)3-methyl-2-pentyne
B)5-methyl-3-pentyne
C)2,2-dimethyl-4-pentyne
D)3,3-dimethyl-1-pentyne

Question 50

Name the product of hydrogenation of trans-2-pentene.

A)pentane
B)cis-2-pentene
C)trans-2-pentane
D)none of these

Question 51

Hydrogenation of vegetable oils converts them into what type of molecule?

A)esters
B)ethers
C)polymers
D)saturated fats

Question 52

Which one of the following molecules can rotate freely around its carbon-carbon bond?

A)acetylene
B)cyclopropane
C)ethane
D)ethylene

Question 53

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

Question 54

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.

Question 55

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

Question 56

What is the product when pure water and ethene are mixed?

A)an alcohol
B)a carboxylic acid
C)an ether
D)no reaction occurs

Question 57

Which of the following statements about cis-trans isomers is not correct?

A)Conversion between cis- and trans-isomers occurs easily by rotation around the double bond.
B)In the trans- isomer,the groups of interest are on opposite sides across the double bond.
C)In the cis- isomer,the groups of interest are on the same side of the double bond.
D)There are no cis-trans isomers in alkynes.

Question 58

How many geometrical and structural isomers are there of butene?

A)3
B)4
C)5
D)6

Question 59

Which compound will exhibit cis-trans isomerism?

A)1,2-dichloroethane
B)1,2-dichloroethene
C)dichloroethyne
D)ethylene

Question 60

Which compound will have the largest dipole moment?

A)cis-1,2-dichloroethylene
B)trans-1,2-dichloroethylene
C)tetrabromoethylene
D)tetrachloroethylene

Question 61

Which name is not correct?

A)1,1 dimethylcyclobutane
B)1,2-dimethylcyclobutane
C)1,3-dimethylcyclohexane
D)1,4-dimethylcyclopentane

Question 62

"Glycerol" is the common name for

A)ethanol.
B)2-propanol.
C)1,2-ethanediol.
D)1,2,3-propanetriol.

Question 63

What type of hybridization does a carbon atom have in a six-membered aromatic ring?

A)sp
B)sp²
C)sp³
D)sp^3d

Question 64

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°.

Question 65

What type of compound contains the -NH₂ functional group?

A)alcohol
B)amine
C)carboxylic acid
D)ether

Question 66

Which of the following compounds is most soluble in water?

A)decanol
B)dimethyl ether
C)ethane
D)ethanol

Question 67

Which structure is meta-dibromobenzene?

A)structure I
B)structure II
C)structure III
D)structure IV

Question 68

Which structures represent the same dibromobenzene compound?

A)I and IV
B)II and III
C)I,II,and III
D)All structures are identical.

Question 69

How many ether isomers have the formula C₄H₁₀O?

A)2
B)3
C)4
D)5

Question 70

Which of the following statements about benzene is true? Benzene

A)contains 3 long bonds and 3 short bonds.
B)is a puckered,six-membered ring.
C)is unusually stable because of delocalized pi electrons.
D)readily undergoes addition reactions.

Question 71

Which of the following statements about amines is not correct? Amines are

A)bases (proton acceptors).
B)converted to ammonium salts by reaction with HCl.
C)organic derivatives of ammonia.
D)very water soluble.

Question 72

Which reaction is not characteristic of aromatic compounds?

A)addition
B)halogenation
C)nitration
D)sulfonation

Question 73

Which structure is para-dibromobenzene?

A)structure I
B)structure II
C)structure III
D)structure IV

Question 74

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

Question 75

What is the proper name for (CH₃)₂CHCH(OH)CH₃?

A)isopropanol
B)isopentanol
C)2-methylpentanol
D)3-methyl-2-butanol

Question 76

"Rubbing alcohol" is the common name for

A)methanol.
B)ethanol.
C)2-propanol.
D)1,2-ethanediol.

Question 77

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

Question 78

The boiling point of 1-propanol should be ________ than the boiling point of methyl ethyl ether.

A)higher than
B)lower than
C)the same as
D)cannot be determined

Question 79

Which compound is not an isomer of the other three?

A)cyclohexane
B)1,2-dimethylcyclobutane
C)1,2-dimethylcyclopropane
D)methylcyclopentane

Question 80

"Wood alcohol" is the common name for

A)methanol.
B)ethanol.
C)2-propanol.
D)1,2-ethanediol.