CHEM 219 Principles of Organic
Chemistry Final Exam Actual Exam
2026/2027 – Complete Exam-Style
Questions & Answers | 100% Certified
Verified – Pass Guaranteed – A+ Graded
SECTION 1: STRUCTURE, BONDING & HYDROCARBONS
QUESTION 1
Define hydrocarbon.
A) A molecule composed only of carbon and oxygen
B) A molecule composed only of carbon and hydrogen
C) A molecule composed of carbon, hydrogen, and oxygen
D) A molecule composed only of hydrogen
Correct ,,,,answer,,,,: B
Rationale: A hydrocarbon is defined as a molecule composed solely of the
elements carbon and hydrogen. This is the fundamental definition in organic
chemistry .
QUESTION 2
,What are the two major classes of hydrocarbon compounds?
A) Saturated and Unsaturated
B) Aliphatic Hydrocarbons and Aromatic Hydrocarbons
C) Alkanes and Cycloalkanes
D) Linear and Branched
Correct ,,,,answer,,,,: B
Rationale: The two major classes of hydrocarbons are Aliphatic Hydrocarbons
(which include alkanes, alkenes, and alkynes) and Aromatic Hydrocarbons (such
as benzene) .
QUESTION 3
Describe the fundamental structural differences between alkanes, alkenes,
and alkynes.
A) Alkanes have at least one C=C; alkenes have only C-C single bonds; alkynes
have at least one C≡C
B) Alkanes have only C-C single bonds; alkenes have at least one C=C; alkynes
have at least one C≡C
C) Alkanes have at least one C≡C; alkenes have only C-C bonds; alkynes have at
least one C=C
D) All have the same bonding structure
Correct ,,,,answer,,,,: B
Rationale: Alkanes have only C-C single bonds (saturated), alkenes have at least
one C=C double bond, and alkynes have at least one C≡C triple bond. This is a
foundational concept in organic chemistry nomenclature .
,QUESTION 4
Name the following alkane using IUPAC nomenclature: CH₃-CH(CH₃)-CH₂-
CH(CH₃)-CH₃
A) 2,4-dimethylpentane
B) 2,4-dimethylhexane
C) 2,3-dimethylpentane
D) 2,4-diethylbutane
Correct ,,,,answer,,,,: A
Rationale: The longest carbon chain has 5 carbons (pentane), with methyl groups
at positions 2 and 4. The correct IUPAC name is 2,4-dimethylpentane .
QUESTION 5
Name the following compound: Cyclohexane with methyl groups at positions
1, 1, and 3
A) 1,1,3-trimethylcyclohexane
B) 1,3,3-trimethylcyclohexane
C) 1,1,3-trimethylhexane
D) 1,1,3-trimethylcyclopentane
Correct ,,,,answer,,,,: A
, Rationale: The parent chain is cyclohexane with three methyl substituents at
positions 1, 1, and 3. IUPAC nomenclature requires numbering to give the lowest
set of locants .
QUESTION 6
Name the following compound: CH₃-CH₂-CH(Cl)-CH₂-CH(Cl)-CH₃
A) 2,4-dichlorohexane
B) 2,4-dichloropentane
C) 2,4-dichlorohexene
D) 2,5-dichlorohexane
Correct ,,,,answer,,,,: A
Rationale: The longest chain has 6 carbons (hexane) with chlorine substituents at
positions 2 and 4. The correct IUPAC name is 2,4-dichlorohexane .
QUESTION 7
What is the molecular formula of an alkane with 6 carbon atoms?
A) C₆H₁₂
B) C₆H₁₄
C) C₆H₁₀
D) C₆H₆
Correct ,,,,answer,,,,: B
Chemistry Final Exam Actual Exam
2026/2027 – Complete Exam-Style
Questions & Answers | 100% Certified
Verified – Pass Guaranteed – A+ Graded
SECTION 1: STRUCTURE, BONDING & HYDROCARBONS
QUESTION 1
Define hydrocarbon.
A) A molecule composed only of carbon and oxygen
B) A molecule composed only of carbon and hydrogen
C) A molecule composed of carbon, hydrogen, and oxygen
D) A molecule composed only of hydrogen
Correct ,,,,answer,,,,: B
Rationale: A hydrocarbon is defined as a molecule composed solely of the
elements carbon and hydrogen. This is the fundamental definition in organic
chemistry .
QUESTION 2
,What are the two major classes of hydrocarbon compounds?
A) Saturated and Unsaturated
B) Aliphatic Hydrocarbons and Aromatic Hydrocarbons
C) Alkanes and Cycloalkanes
D) Linear and Branched
Correct ,,,,answer,,,,: B
Rationale: The two major classes of hydrocarbons are Aliphatic Hydrocarbons
(which include alkanes, alkenes, and alkynes) and Aromatic Hydrocarbons (such
as benzene) .
QUESTION 3
Describe the fundamental structural differences between alkanes, alkenes,
and alkynes.
A) Alkanes have at least one C=C; alkenes have only C-C single bonds; alkynes
have at least one C≡C
B) Alkanes have only C-C single bonds; alkenes have at least one C=C; alkynes
have at least one C≡C
C) Alkanes have at least one C≡C; alkenes have only C-C bonds; alkynes have at
least one C=C
D) All have the same bonding structure
Correct ,,,,answer,,,,: B
Rationale: Alkanes have only C-C single bonds (saturated), alkenes have at least
one C=C double bond, and alkynes have at least one C≡C triple bond. This is a
foundational concept in organic chemistry nomenclature .
,QUESTION 4
Name the following alkane using IUPAC nomenclature: CH₃-CH(CH₃)-CH₂-
CH(CH₃)-CH₃
A) 2,4-dimethylpentane
B) 2,4-dimethylhexane
C) 2,3-dimethylpentane
D) 2,4-diethylbutane
Correct ,,,,answer,,,,: A
Rationale: The longest carbon chain has 5 carbons (pentane), with methyl groups
at positions 2 and 4. The correct IUPAC name is 2,4-dimethylpentane .
QUESTION 5
Name the following compound: Cyclohexane with methyl groups at positions
1, 1, and 3
A) 1,1,3-trimethylcyclohexane
B) 1,3,3-trimethylcyclohexane
C) 1,1,3-trimethylhexane
D) 1,1,3-trimethylcyclopentane
Correct ,,,,answer,,,,: A
, Rationale: The parent chain is cyclohexane with three methyl substituents at
positions 1, 1, and 3. IUPAC nomenclature requires numbering to give the lowest
set of locants .
QUESTION 6
Name the following compound: CH₃-CH₂-CH(Cl)-CH₂-CH(Cl)-CH₃
A) 2,4-dichlorohexane
B) 2,4-dichloropentane
C) 2,4-dichlorohexene
D) 2,5-dichlorohexane
Correct ,,,,answer,,,,: A
Rationale: The longest chain has 6 carbons (hexane) with chlorine substituents at
positions 2 and 4. The correct IUPAC name is 2,4-dichlorohexane .
QUESTION 7
What is the molecular formula of an alkane with 6 carbon atoms?
A) C₆H₁₂
B) C₆H₁₄
C) C₆H₁₀
D) C₆H₆
Correct ,,,,answer,,,,: B
