CHEM219 / CHEM 219 Complete Course Bundle
Modules 5 & 6 Exam | Principles of Organic
Chemistry with Lab Portage Learning | Latest
2026–2027 Questions with Answers & Rationales
QUESTION 1
Both ethanol (CH₃CH₂OH) and 1-propanol (CH₃CH₂CH₂OH) are classified as
which type of alcohol?
A. Secondary alcohols
B. Tertiary alcohols
C. Cyclic alcohols
D. Primary alcohols
Answer: D. Primary alcohols
Rationale: Both ethanol and 1-propanol have the OH group attached to a carbon
that is bonded to only one other carbon atom, making them primary (1°) alcohols.
In ethanol, the OH-bearing carbon (C1) is bonded to one carbon (C2). In 1-
propanol, the OH-bearing carbon (C1) is bonded to one carbon (C2). Primary
alcohols have the general structure R-CH₂OH.
QUESTION 2
Alcohols can act as weak acids or weak bases depending on their environment.
This property is called:
A. Isomerism
B. Amphoteric
C. Catenation
D. Hybridization
Answer: B. Amphoteric
Rationale: Alcohols are amphoteric substances because they can act as weak acids
(donating the O-H proton as H⁺) or as weak bases (accepting H⁺ using a lone pair
,on the oxygen atom) depending on the surrounding environment. This dual nature
is characteristic of amphoteric compounds.
QUESTION 3
The product formed when a primary alcohol is oxidized is initially a(n):
A. Ketone
B. Aldehyde
C. Carboxylic acid
D. Ester
Answer: B. Aldehyde
Rationale: Oxidation of a primary alcohol (R-CH₂OH) initially produces an
aldehyde (R-CHO). Upon further oxidation, the aldehyde can be oxidized to a
carboxylic acid (R-COOH). Secondary alcohols oxidize to ketones, and tertiary
alcohols do not undergo oxidation under normal conditions.
QUESTION 4
What is the IUPAC name for the compound CH₃CH(OH)CH₂CH₃?
A. 1-Butanol
B. 2-Butanol
C. 2-Methyl-1-propanol
D. Butan-2-ol
Answer: B. 2-Butanol
Rationale: The compound CH₃CH(OH)CH₂CH₃ has the hydroxyl group attached
to the second carbon of a four-carbon chain. The parent chain is butane, and the
OH group is on carbon 2, making the IUPAC name 2-butanol (or butan-2-ol). The
longest chain containing the OH group is selected.
QUESTION 5
Which of the following is a secondary alcohol?
,A. CH₃OH
B. CH₃CH₂OH
C. CH₃CH(OH)CH₃
D. (CH₃)₃COH
Answer: C. CH₃CH(OH)CH₃
Rationale: A secondary alcohol has the OH group attached to a carbon that is
bonded to two other carbon atoms. In CH₃CH(OH)CH₃ (2-propanol), the OH-
bearing carbon is bonded to two methyl groups, making it a secondary alcohol.
CH₃OH and CH₃CH₂OH are primary alcohols, and (CH₃)₃COH is a tertiary
alcohol.
QUESTION 6
The functional group of an alcohol is:
A. Hydroxyl group (-OH)
B. Carbonyl group (C=O)
C. Carboxyl group (-COOH)
D. Amino group (-NH₂)
Answer: A. Hydroxyl group (-OH)
Rationale: The functional group of an alcohol is the hydroxyl group (-OH)
attached to a carbon atom. The carbonyl group (C=O) is found in aldehydes,
ketones, and carboxylic acids. The carboxyl group (-COOH) is found in carboxylic
acids. The amino group (-NH₂) is found in amines.
QUESTION 7
Which of the following alcohols is most soluble in water?
A. 1-Butanol
B. 1-Pentanol
C. Methanol
D. 1-Hexanol
Answer: C. Methanol
, Rationale: Solubility of alcohols in water decreases as the length of the carbon
chain increases because the nonpolar hydrocarbon portion becomes larger relative
to the polar OH group. Methanol (CH₃OH) has the shortest carbon chain and is
infinitely soluble in water. As chain length increases, solubility decreases.
QUESTION 8
What is the product when 2-propanol is oxidized?
A. Propanal
B. Propanone (acetone)
C. Propanoic acid
D. Propene
Answer: B. Propanone (acetone)
Rationale: 2-Propanol (CH₃CH(OH)CH₃) is a secondary alcohol. Oxidation of a
secondary alcohol produces a ketone. The product is propanone (acetone,
CH₃COCH₃). Primary alcohols oxidize to aldehydes then carboxylic acids, and
tertiary alcohols do not readily oxidize.
QUESTION 9
The boiling point of alcohols is higher than alkanes of similar molecular weight
due to:
A. Ionic bonding
B. Hydrogen bonding
C. Covalent bonding
D. Van der Waals forces
Answer: B. Hydrogen bonding
Rationale: Alcohols have significantly higher boiling points than alkanes of
similar molecular weight because they can form hydrogen bonds between
molecules. The O-H bond is polar, allowing the hydrogen atom to form hydrogen
bonds with the oxygen atom of neighboring molecules, requiring more energy to
overcome.
Modules 5 & 6 Exam | Principles of Organic
Chemistry with Lab Portage Learning | Latest
2026–2027 Questions with Answers & Rationales
QUESTION 1
Both ethanol (CH₃CH₂OH) and 1-propanol (CH₃CH₂CH₂OH) are classified as
which type of alcohol?
A. Secondary alcohols
B. Tertiary alcohols
C. Cyclic alcohols
D. Primary alcohols
Answer: D. Primary alcohols
Rationale: Both ethanol and 1-propanol have the OH group attached to a carbon
that is bonded to only one other carbon atom, making them primary (1°) alcohols.
In ethanol, the OH-bearing carbon (C1) is bonded to one carbon (C2). In 1-
propanol, the OH-bearing carbon (C1) is bonded to one carbon (C2). Primary
alcohols have the general structure R-CH₂OH.
QUESTION 2
Alcohols can act as weak acids or weak bases depending on their environment.
This property is called:
A. Isomerism
B. Amphoteric
C. Catenation
D. Hybridization
Answer: B. Amphoteric
Rationale: Alcohols are amphoteric substances because they can act as weak acids
(donating the O-H proton as H⁺) or as weak bases (accepting H⁺ using a lone pair
,on the oxygen atom) depending on the surrounding environment. This dual nature
is characteristic of amphoteric compounds.
QUESTION 3
The product formed when a primary alcohol is oxidized is initially a(n):
A. Ketone
B. Aldehyde
C. Carboxylic acid
D. Ester
Answer: B. Aldehyde
Rationale: Oxidation of a primary alcohol (R-CH₂OH) initially produces an
aldehyde (R-CHO). Upon further oxidation, the aldehyde can be oxidized to a
carboxylic acid (R-COOH). Secondary alcohols oxidize to ketones, and tertiary
alcohols do not undergo oxidation under normal conditions.
QUESTION 4
What is the IUPAC name for the compound CH₃CH(OH)CH₂CH₃?
A. 1-Butanol
B. 2-Butanol
C. 2-Methyl-1-propanol
D. Butan-2-ol
Answer: B. 2-Butanol
Rationale: The compound CH₃CH(OH)CH₂CH₃ has the hydroxyl group attached
to the second carbon of a four-carbon chain. The parent chain is butane, and the
OH group is on carbon 2, making the IUPAC name 2-butanol (or butan-2-ol). The
longest chain containing the OH group is selected.
QUESTION 5
Which of the following is a secondary alcohol?
,A. CH₃OH
B. CH₃CH₂OH
C. CH₃CH(OH)CH₃
D. (CH₃)₃COH
Answer: C. CH₃CH(OH)CH₃
Rationale: A secondary alcohol has the OH group attached to a carbon that is
bonded to two other carbon atoms. In CH₃CH(OH)CH₃ (2-propanol), the OH-
bearing carbon is bonded to two methyl groups, making it a secondary alcohol.
CH₃OH and CH₃CH₂OH are primary alcohols, and (CH₃)₃COH is a tertiary
alcohol.
QUESTION 6
The functional group of an alcohol is:
A. Hydroxyl group (-OH)
B. Carbonyl group (C=O)
C. Carboxyl group (-COOH)
D. Amino group (-NH₂)
Answer: A. Hydroxyl group (-OH)
Rationale: The functional group of an alcohol is the hydroxyl group (-OH)
attached to a carbon atom. The carbonyl group (C=O) is found in aldehydes,
ketones, and carboxylic acids. The carboxyl group (-COOH) is found in carboxylic
acids. The amino group (-NH₂) is found in amines.
QUESTION 7
Which of the following alcohols is most soluble in water?
A. 1-Butanol
B. 1-Pentanol
C. Methanol
D. 1-Hexanol
Answer: C. Methanol
, Rationale: Solubility of alcohols in water decreases as the length of the carbon
chain increases because the nonpolar hydrocarbon portion becomes larger relative
to the polar OH group. Methanol (CH₃OH) has the shortest carbon chain and is
infinitely soluble in water. As chain length increases, solubility decreases.
QUESTION 8
What is the product when 2-propanol is oxidized?
A. Propanal
B. Propanone (acetone)
C. Propanoic acid
D. Propene
Answer: B. Propanone (acetone)
Rationale: 2-Propanol (CH₃CH(OH)CH₃) is a secondary alcohol. Oxidation of a
secondary alcohol produces a ketone. The product is propanone (acetone,
CH₃COCH₃). Primary alcohols oxidize to aldehydes then carboxylic acids, and
tertiary alcohols do not readily oxidize.
QUESTION 9
The boiling point of alcohols is higher than alkanes of similar molecular weight
due to:
A. Ionic bonding
B. Hydrogen bonding
C. Covalent bonding
D. Van der Waals forces
Answer: B. Hydrogen bonding
Rationale: Alcohols have significantly higher boiling points than alkanes of
similar molecular weight because they can form hydrogen bonds between
molecules. The O-H bond is polar, allowing the hydrogen atom to form hydrogen
bonds with the oxygen atom of neighboring molecules, requiring more energy to
overcome.
