Organic Chemistry 2 ACS Final Exam
2026 PDF – Complete Practice & Study
Guide
Question 1: Which is the correct IUPAC name for the following structure? (6-
membered carbon chain with alcohol at C3 and two methyl groups on C5)
A) 5,5-dimethyl-2-hexanol
B) 5,5-dimethyl-3-hexanol
C) 3,3-dimethyl-5-hexanol
D) 2,2-dimethyl-4-hexanol
Correct ,,,answer,,,,: B. 5,5-dimethyl-3-hexanol
Rationale: The longest continuous chain contains six carbons (hexanol). The
alcohol functional group receives the lowest possible number, placing it at C3.
Two methyl groups on C5 give the 5,5-dimethyl designation.
Question 2: Which structure correctly represents 4-bromo-3-nitrophenol?
A) Phenol with Br at C4 and NO2 at C3
B) Benzene with OH at C1, Br at C2, NO2 at C4
C) Phenol with Br at C3 and NO2 at C2
D) Benzene with OH at C1, Br at C4, NO2 at C3
Correct ,,,answer,,,,: A. Phenol with Br at C4 and NO2 at C3
,Rationale: Phenol has the OH group as the parent functional group (C1). Bromine
at C4 and nitro at C3 gives 4-bromo-3-nitrophenol. The numbering prioritizes the
OH group, then substituents get the lowest possible numbers.
Question 3: What is the correct name for (Z)-3,5-dimethyl-3-nonene?
A) A nine-carbon chain with methyl groups on C3 and C5 and a double bond
between C3 and C4 with both higher priority groups on the same side
B) A nine-carbon chain with methyl groups on C3 and C5 and a double bond
between C3 and C4 with higher priority groups on opposite sides
C) A seven-carbon chain with methyl groups on C3 and C5
D) A nine-carbon chain with ethyl groups on C3 and C5
Correct ,,,answer,,,,: A. A nine-carbon chain with methyl groups on C3 and C5
and a double bond between C3 and C4 with both higher priority groups on the
same side
Rationale: The (Z) designation indicates that the two higher priority groups on the
double bond are on the same side. The parent chain is nonene (9 carbons) with the
double bond between C3 and C4, and methyl substituents at C3 and C5.
Question 4: Which of the following is the correct IUPAC name for the tert-butyl
substituent?
A) (1,1-dimethylethyl)
B) (1,1,1-trimethyl)
C) (1-methyl-2-propyl)
D) (2-methyl-2-propyl)
,Correct ,,,answer,,,,: A. (1,1-dimethylethyl)
Rationale: The tert-butyl group is systematically named as (1,1-dimethylethyl)
because the point of attachment is at C1, which has three methyl groups attached.
Question 5: What is the relationship between the following two compounds? (Two
compounds with the same connectivity but different spatial arrangement)
A) Enantiomers
B) Diastereomers
C) Constitutional isomers
D) Resonance forms
Correct ,,,answer,,,,: B. Diastereomers
Rationale: Diastereomers are stereoisomers that are not mirror images of each
other. They have the same connectivity but different spatial arrangements and are
not enantiomeric pairs.
Question 6: Which compound is expected to be optically active at room
temperature?
A) A meso compound
B) A racemic mixture
C) A single enantiomer
D) An achiral compound
Correct ,,,answer,,,,: C. A single enantiomer
, Rationale: Optical activity requires a chiral molecule that is not superimposable
on its mirror image. A single enantiomer rotates plane-polarized light. Racemic
mixtures show no net optical activity (cancellation). Meso compounds are achiral
despite having chiral centers.
Question 7: Identify the meso compound(s).
A) I only
B) II only
C) I and III only
D) I, II, and III
Correct ,,,answer,,,,: B. II only
Rationale: A meso compound has chiral centers but an internal plane of
symmetry, making the molecule achiral overall. Only compound II possesses this
internal symmetry plane.
Question 8: Which is the correct hybridization state and geometry for the carbon
atom in HCN?
A) sp, linear
B) sp², trigonal planar
C) sp³, tetrahedral
D) None of the above
Correct ,,,answer,,,,: A. sp, linear
2026 PDF – Complete Practice & Study
Guide
Question 1: Which is the correct IUPAC name for the following structure? (6-
membered carbon chain with alcohol at C3 and two methyl groups on C5)
A) 5,5-dimethyl-2-hexanol
B) 5,5-dimethyl-3-hexanol
C) 3,3-dimethyl-5-hexanol
D) 2,2-dimethyl-4-hexanol
Correct ,,,answer,,,,: B. 5,5-dimethyl-3-hexanol
Rationale: The longest continuous chain contains six carbons (hexanol). The
alcohol functional group receives the lowest possible number, placing it at C3.
Two methyl groups on C5 give the 5,5-dimethyl designation.
Question 2: Which structure correctly represents 4-bromo-3-nitrophenol?
A) Phenol with Br at C4 and NO2 at C3
B) Benzene with OH at C1, Br at C2, NO2 at C4
C) Phenol with Br at C3 and NO2 at C2
D) Benzene with OH at C1, Br at C4, NO2 at C3
Correct ,,,answer,,,,: A. Phenol with Br at C4 and NO2 at C3
,Rationale: Phenol has the OH group as the parent functional group (C1). Bromine
at C4 and nitro at C3 gives 4-bromo-3-nitrophenol. The numbering prioritizes the
OH group, then substituents get the lowest possible numbers.
Question 3: What is the correct name for (Z)-3,5-dimethyl-3-nonene?
A) A nine-carbon chain with methyl groups on C3 and C5 and a double bond
between C3 and C4 with both higher priority groups on the same side
B) A nine-carbon chain with methyl groups on C3 and C5 and a double bond
between C3 and C4 with higher priority groups on opposite sides
C) A seven-carbon chain with methyl groups on C3 and C5
D) A nine-carbon chain with ethyl groups on C3 and C5
Correct ,,,answer,,,,: A. A nine-carbon chain with methyl groups on C3 and C5
and a double bond between C3 and C4 with both higher priority groups on the
same side
Rationale: The (Z) designation indicates that the two higher priority groups on the
double bond are on the same side. The parent chain is nonene (9 carbons) with the
double bond between C3 and C4, and methyl substituents at C3 and C5.
Question 4: Which of the following is the correct IUPAC name for the tert-butyl
substituent?
A) (1,1-dimethylethyl)
B) (1,1,1-trimethyl)
C) (1-methyl-2-propyl)
D) (2-methyl-2-propyl)
,Correct ,,,answer,,,,: A. (1,1-dimethylethyl)
Rationale: The tert-butyl group is systematically named as (1,1-dimethylethyl)
because the point of attachment is at C1, which has three methyl groups attached.
Question 5: What is the relationship between the following two compounds? (Two
compounds with the same connectivity but different spatial arrangement)
A) Enantiomers
B) Diastereomers
C) Constitutional isomers
D) Resonance forms
Correct ,,,answer,,,,: B. Diastereomers
Rationale: Diastereomers are stereoisomers that are not mirror images of each
other. They have the same connectivity but different spatial arrangements and are
not enantiomeric pairs.
Question 6: Which compound is expected to be optically active at room
temperature?
A) A meso compound
B) A racemic mixture
C) A single enantiomer
D) An achiral compound
Correct ,,,answer,,,,: C. A single enantiomer
, Rationale: Optical activity requires a chiral molecule that is not superimposable
on its mirror image. A single enantiomer rotates plane-polarized light. Racemic
mixtures show no net optical activity (cancellation). Meso compounds are achiral
despite having chiral centers.
Question 7: Identify the meso compound(s).
A) I only
B) II only
C) I and III only
D) I, II, and III
Correct ,,,answer,,,,: B. II only
Rationale: A meso compound has chiral centers but an internal plane of
symmetry, making the molecule achiral overall. Only compound II possesses this
internal symmetry plane.
Question 8: Which is the correct hybridization state and geometry for the carbon
atom in HCN?
A) sp, linear
B) sp², trigonal planar
C) sp³, tetrahedral
D) None of the above
Correct ,,,answer,,,,: A. sp, linear
