CHEM 219: Module 4 Exam -
Hydrocarbons
Alkanes, Alkenes, Alkynes & Aromatics
Portage Learning 2026/2027 Mastery - 500 Practice Questions
Alkanes - Saturation
Q1: Which of the following best describes an alkane?
A. Unsaturated hydrocarbon
B. Saturated hydrocarbon
C. Aromatic hydrocarbon
D. Cyclic alkene
Correct Answer: B
Mastery Tip: Alkanes are saturated hydrocarbons because they contain only single bonds between carbon atoms,
meaning they hold the maximum number of hydrogen atoms possible.
Nomenclature - Alkenes
Q2: What is the IUPAC name for a five-carbon chain with a double bond starting at
the second carbon?
A. 2-pentane
B. 2-pentyne
C. 2-pentene
D. Cyclopentene
Correct Answer: C
Mastery Tip: A 5-carbon alkene uses the root 'pent-' and suffix '-ene'. The number '2-' indicates the location of the
double bond.
CHEM 219 Module 4 - Page 1
,Isomerism
Q3: Compounds that have the same molecular formula but different structural
arrangements are called:
A. Isotopes
B. Isobars
C. Structural Isomers
D. Conformers
Correct Answer: C
Mastery Tip: Structural (constitutional) isomers have the same formula (e.g., C4H10) but different bonding
sequences (e.g., butane vs. isobutane).
Reactions - Hydrogenation
Q4: What is the product of the hydrogenation of 1-propene in the presence of a
platinum catalyst?
A. Propyne
B. Propane
C. Propanol
D. Cyclopropane
Correct Answer: B
Mastery Tip: Hydrogenation adds H2 across a double bond, converting an unsaturated alkene into a saturated
alkane.
Aromatic Hydrocarbons
Q5: Which molecule is the simplest example of an aromatic hydrocarbon?
A. Cyclohexane
B. Benzene
C. Hexene
D. Toluene
Correct Answer: B
Mastery Tip: Benzene (C6H6) is the foundational aromatic compound, characterized by a ring of six carbons with
alternating double bonds (delocalized pi system).
Geometric Isomerism
Q6: Which type of isomerism is specifically associated with the restricted rotation
around a carbon-carbon double bond?
A. Structural
B. Cis-Trans (Geometric)
C. Optical
D. Functional
Correct Answer: B
Mastery Tip: Cis-trans isomerism occurs in alkenes because the pi bond prevents rotation, locking substituents on
either the same side (cis) or opposite sides (trans).
CHEM 219 Module 4 - Page 2
,Alkanes - Saturation
Q7: Which of the following best describes an alkane?
A. Unsaturated hydrocarbon
B. Saturated hydrocarbon
C. Aromatic hydrocarbon
D. Cyclic alkene
Correct Answer: B
Mastery Tip: Alkanes are saturated hydrocarbons because they contain only single bonds between carbon atoms,
meaning they hold the maximum number of hydrogen atoms possible.
Nomenclature - Alkenes
Q8: What is the IUPAC name for a five-carbon chain with a double bond starting at
the second carbon?
A. 2-pentane
B. 2-pentyne
C. 2-pentene
D. Cyclopentene
Correct Answer: C
Mastery Tip: A 5-carbon alkene uses the root 'pent-' and suffix '-ene'. The number '2-' indicates the location of the
double bond.
Isomerism
Q9: Compounds that have the same molecular formula but different structural
arrangements are called:
A. Isotopes
B. Isobars
C. Structural Isomers
D. Conformers
Correct Answer: C
Mastery Tip: Structural (constitutional) isomers have the same formula (e.g., C4H10) but different bonding
sequences (e.g., butane vs. isobutane).
Reactions - Hydrogenation
Q10: What is the product of the hydrogenation of 1-propene in the presence of a
platinum catalyst?
A. Propyne
B. Propane
C. Propanol
D. Cyclopropane
Correct Answer: B
Mastery Tip: Hydrogenation adds H2 across a double bond, converting an unsaturated alkene into a saturated
alkane.
CHEM 219 Module 4 - Page 3
, Aromatic Hydrocarbons
Q11: Which molecule is the simplest example of an aromatic hydrocarbon?
A. Cyclohexane
B. Benzene
C. Hexene
D. Toluene
Correct Answer: B
Mastery Tip: Benzene (C6H6) is the foundational aromatic compound, characterized by a ring of six carbons with
alternating double bonds (delocalized pi system).
Geometric Isomerism
Q12: Which type of isomerism is specifically associated with the restricted rotation
around a carbon-carbon double bond?
A. Structural
B. Cis-Trans (Geometric)
C. Optical
D. Functional
Correct Answer: B
Mastery Tip: Cis-trans isomerism occurs in alkenes because the pi bond prevents rotation, locking substituents on
either the same side (cis) or opposite sides (trans).
Alkanes - Saturation
Q13: Which of the following best describes an alkane?
A. Unsaturated hydrocarbon
B. Saturated hydrocarbon
C. Aromatic hydrocarbon
D. Cyclic alkene
Correct Answer: B
Mastery Tip: Alkanes are saturated hydrocarbons because they contain only single bonds between carbon atoms,
meaning they hold the maximum number of hydrogen atoms possible.
Nomenclature - Alkenes
Q14: What is the IUPAC name for a five-carbon chain with a double bond starting at
the second carbon?
A. 2-pentane
B. 2-pentyne
C. 2-pentene
D. Cyclopentene
Correct Answer: C
Mastery Tip: A 5-carbon alkene uses the root 'pent-' and suffix '-ene'. The number '2-' indicates the location of the
double bond.
CHEM 219 Module 4 - Page 4
Hydrocarbons
Alkanes, Alkenes, Alkynes & Aromatics
Portage Learning 2026/2027 Mastery - 500 Practice Questions
Alkanes - Saturation
Q1: Which of the following best describes an alkane?
A. Unsaturated hydrocarbon
B. Saturated hydrocarbon
C. Aromatic hydrocarbon
D. Cyclic alkene
Correct Answer: B
Mastery Tip: Alkanes are saturated hydrocarbons because they contain only single bonds between carbon atoms,
meaning they hold the maximum number of hydrogen atoms possible.
Nomenclature - Alkenes
Q2: What is the IUPAC name for a five-carbon chain with a double bond starting at
the second carbon?
A. 2-pentane
B. 2-pentyne
C. 2-pentene
D. Cyclopentene
Correct Answer: C
Mastery Tip: A 5-carbon alkene uses the root 'pent-' and suffix '-ene'. The number '2-' indicates the location of the
double bond.
CHEM 219 Module 4 - Page 1
,Isomerism
Q3: Compounds that have the same molecular formula but different structural
arrangements are called:
A. Isotopes
B. Isobars
C. Structural Isomers
D. Conformers
Correct Answer: C
Mastery Tip: Structural (constitutional) isomers have the same formula (e.g., C4H10) but different bonding
sequences (e.g., butane vs. isobutane).
Reactions - Hydrogenation
Q4: What is the product of the hydrogenation of 1-propene in the presence of a
platinum catalyst?
A. Propyne
B. Propane
C. Propanol
D. Cyclopropane
Correct Answer: B
Mastery Tip: Hydrogenation adds H2 across a double bond, converting an unsaturated alkene into a saturated
alkane.
Aromatic Hydrocarbons
Q5: Which molecule is the simplest example of an aromatic hydrocarbon?
A. Cyclohexane
B. Benzene
C. Hexene
D. Toluene
Correct Answer: B
Mastery Tip: Benzene (C6H6) is the foundational aromatic compound, characterized by a ring of six carbons with
alternating double bonds (delocalized pi system).
Geometric Isomerism
Q6: Which type of isomerism is specifically associated with the restricted rotation
around a carbon-carbon double bond?
A. Structural
B. Cis-Trans (Geometric)
C. Optical
D. Functional
Correct Answer: B
Mastery Tip: Cis-trans isomerism occurs in alkenes because the pi bond prevents rotation, locking substituents on
either the same side (cis) or opposite sides (trans).
CHEM 219 Module 4 - Page 2
,Alkanes - Saturation
Q7: Which of the following best describes an alkane?
A. Unsaturated hydrocarbon
B. Saturated hydrocarbon
C. Aromatic hydrocarbon
D. Cyclic alkene
Correct Answer: B
Mastery Tip: Alkanes are saturated hydrocarbons because they contain only single bonds between carbon atoms,
meaning they hold the maximum number of hydrogen atoms possible.
Nomenclature - Alkenes
Q8: What is the IUPAC name for a five-carbon chain with a double bond starting at
the second carbon?
A. 2-pentane
B. 2-pentyne
C. 2-pentene
D. Cyclopentene
Correct Answer: C
Mastery Tip: A 5-carbon alkene uses the root 'pent-' and suffix '-ene'. The number '2-' indicates the location of the
double bond.
Isomerism
Q9: Compounds that have the same molecular formula but different structural
arrangements are called:
A. Isotopes
B. Isobars
C. Structural Isomers
D. Conformers
Correct Answer: C
Mastery Tip: Structural (constitutional) isomers have the same formula (e.g., C4H10) but different bonding
sequences (e.g., butane vs. isobutane).
Reactions - Hydrogenation
Q10: What is the product of the hydrogenation of 1-propene in the presence of a
platinum catalyst?
A. Propyne
B. Propane
C. Propanol
D. Cyclopropane
Correct Answer: B
Mastery Tip: Hydrogenation adds H2 across a double bond, converting an unsaturated alkene into a saturated
alkane.
CHEM 219 Module 4 - Page 3
, Aromatic Hydrocarbons
Q11: Which molecule is the simplest example of an aromatic hydrocarbon?
A. Cyclohexane
B. Benzene
C. Hexene
D. Toluene
Correct Answer: B
Mastery Tip: Benzene (C6H6) is the foundational aromatic compound, characterized by a ring of six carbons with
alternating double bonds (delocalized pi system).
Geometric Isomerism
Q12: Which type of isomerism is specifically associated with the restricted rotation
around a carbon-carbon double bond?
A. Structural
B. Cis-Trans (Geometric)
C. Optical
D. Functional
Correct Answer: B
Mastery Tip: Cis-trans isomerism occurs in alkenes because the pi bond prevents rotation, locking substituents on
either the same side (cis) or opposite sides (trans).
Alkanes - Saturation
Q13: Which of the following best describes an alkane?
A. Unsaturated hydrocarbon
B. Saturated hydrocarbon
C. Aromatic hydrocarbon
D. Cyclic alkene
Correct Answer: B
Mastery Tip: Alkanes are saturated hydrocarbons because they contain only single bonds between carbon atoms,
meaning they hold the maximum number of hydrogen atoms possible.
Nomenclature - Alkenes
Q14: What is the IUPAC name for a five-carbon chain with a double bond starting at
the second carbon?
A. 2-pentane
B. 2-pentyne
C. 2-pentene
D. Cyclopentene
Correct Answer: C
Mastery Tip: A 5-carbon alkene uses the root 'pent-' and suffix '-ene'. The number '2-' indicates the location of the
double bond.
CHEM 219 Module 4 - Page 4
