CHEM 219: Organic Chemistry - Module 6
Exam
Aldehydes & Ketones: Structure, Properties & Reactions
Portage Learning Mastery - 500 Verified Questions (2026 Edition)
Functional Group Identification
Q1: What is the primary structural difference between an aldehyde and a ketone?
A. Aldehydes have a carbonyl group, ketones do not.
B. Ketones are at the end of a carbon chain, aldehydes are in the middle.
C. Aldehydes have the carbonyl carbon bonded to at least one hydrogen; ketones have it bonded to two
carbons.
D. Aldehydes contain nitrogen, while ketones only contain oxygen.
Answer: C
Study Note: The carbonyl group (C=O) in an aldehyde is terminal (attached to at least one H), while in a ketone, it is internal
(attached to two other carbon atoms).
Nomenclature
Q2: What is the IUPAC name for a three-carbon ketone?
A. Propanal
B. Propanone
C. Propanoic acid
D. Isopropanol
Answer: B
Study Note: The three-carbon alkane is propane. For a ketone, the suffix '-e' is replaced with '-one'. Propanone is also commonly
known as acetone.
Oxidation Reactions
Q3: Which of the following will occur when an aldehyde is treated with an oxidizing
agent like Tollens' reagent?
A. It is reduced to a primary alcohol.
B. It is oxidized to a carboxylic acid.
C. It is converted into a ketone.
D. No reaction occurs.
Answer: B
Study Note: Aldehydes are easily oxidized to carboxylic acids. Tollens' reagent (silver mirror test) is a classic test for the presence
of an aldehyde.
CHEM 219 Module 6 - Page 1
,Reduction Reactions
Q4: Reducing a ketone with NaBH4 (Sodium Borohydride) results in the formation of a:
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. Carboxylic acid
Answer: B
Study Note: Reduction of a ketone adds hydrogen across the C=O bond, resulting in a secondary alcohol. Reduction of an
aldehyde results in a primary alcohol.
Physical Properties
Q5: Aldehydes and ketones have lower boiling points than alcohols of similar mass
because:
A. They are non-polar.
B. They cannot form hydrogen bonds with each other.
C. They have higher molar masses.
D. They are gases at room temperature.
Answer: B
Study Note: Unlike alcohols, aldehydes and ketones do not have an H atom directly bonded to the oxygen, so they cannot form
intermolecular hydrogen bonds.
Functional Group Identification
Q6: What is the primary structural difference between an aldehyde and a ketone?
A. Aldehydes have a carbonyl group, ketones do not.
B. Ketones are at the end of a carbon chain, aldehydes are in the middle.
C. Aldehydes have the carbonyl carbon bonded to at least one hydrogen; ketones have it bonded to two
carbons.
D. Aldehydes contain nitrogen, while ketones only contain oxygen.
Answer: C
Study Note: The carbonyl group (C=O) in an aldehyde is terminal (attached to at least one H), while in a ketone, it is internal
(attached to two other carbon atoms).
Nomenclature
Q7: What is the IUPAC name for a three-carbon ketone?
A. Propanal
B. Propanone
C. Propanoic acid
D. Isopropanol
Answer: B
Study Note: The three-carbon alkane is propane. For a ketone, the suffix '-e' is replaced with '-one'. Propanone is also commonly
known as acetone.
CHEM 219 Module 6 - Page 2
,Oxidation Reactions
Q8: Which of the following will occur when an aldehyde is treated with an oxidizing
agent like Tollens' reagent?
A. It is reduced to a primary alcohol.
B. It is oxidized to a carboxylic acid.
C. It is converted into a ketone.
D. No reaction occurs.
Answer: B
Study Note: Aldehydes are easily oxidized to carboxylic acids. Tollens' reagent (silver mirror test) is a classic test for the presence
of an aldehyde.
Reduction Reactions
Q9: Reducing a ketone with NaBH4 (Sodium Borohydride) results in the formation of a:
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. Carboxylic acid
Answer: B
Study Note: Reduction of a ketone adds hydrogen across the C=O bond, resulting in a secondary alcohol. Reduction of an
aldehyde results in a primary alcohol.
Physical Properties
Q10: Aldehydes and ketones have lower boiling points than alcohols of similar mass
because:
A. They are non-polar.
B. They cannot form hydrogen bonds with each other.
C. They have higher molar masses.
D. They are gases at room temperature.
Answer: B
Study Note: Unlike alcohols, aldehydes and ketones do not have an H atom directly bonded to the oxygen, so they cannot form
intermolecular hydrogen bonds.
Functional Group Identification
Q11: What is the primary structural difference between an aldehyde and a ketone?
A. Aldehydes have a carbonyl group, ketones do not.
B. Ketones are at the end of a carbon chain, aldehydes are in the middle.
C. Aldehydes have the carbonyl carbon bonded to at least one hydrogen; ketones have it bonded to two
carbons.
D. Aldehydes contain nitrogen, while ketones only contain oxygen.
Answer: C
Study Note: The carbonyl group (C=O) in an aldehyde is terminal (attached to at least one H), while in a ketone, it is internal
(attached to two other carbon atoms).
CHEM 219 Module 6 - Page 3
, Nomenclature
Q12: What is the IUPAC name for a three-carbon ketone?
A. Propanal
B. Propanone
C. Propanoic acid
D. Isopropanol
Answer: B
Study Note: The three-carbon alkane is propane. For a ketone, the suffix '-e' is replaced with '-one'. Propanone is also commonly
known as acetone.
Oxidation Reactions
Q13: Which of the following will occur when an aldehyde is treated with an oxidizing
agent like Tollens' reagent?
A. It is reduced to a primary alcohol.
B. It is oxidized to a carboxylic acid.
C. It is converted into a ketone.
D. No reaction occurs.
Answer: B
Study Note: Aldehydes are easily oxidized to carboxylic acids. Tollens' reagent (silver mirror test) is a classic test for the presence
of an aldehyde.
Reduction Reactions
Q14: Reducing a ketone with NaBH4 (Sodium Borohydride) results in the formation of a:
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. Carboxylic acid
Answer: B
Study Note: Reduction of a ketone adds hydrogen across the C=O bond, resulting in a secondary alcohol. Reduction of an
aldehyde results in a primary alcohol.
Physical Properties
Q15: Aldehydes and ketones have lower boiling points than alcohols of similar mass
because:
A. They are non-polar.
B. They cannot form hydrogen bonds with each other.
C. They have higher molar masses.
D. They are gases at room temperature.
Answer: B
Study Note: Unlike alcohols, aldehydes and ketones do not have an H atom directly bonded to the oxygen, so they cannot form
intermolecular hydrogen bonds.
CHEM 219 Module 6 - Page 4
Exam
Aldehydes & Ketones: Structure, Properties & Reactions
Portage Learning Mastery - 500 Verified Questions (2026 Edition)
Functional Group Identification
Q1: What is the primary structural difference between an aldehyde and a ketone?
A. Aldehydes have a carbonyl group, ketones do not.
B. Ketones are at the end of a carbon chain, aldehydes are in the middle.
C. Aldehydes have the carbonyl carbon bonded to at least one hydrogen; ketones have it bonded to two
carbons.
D. Aldehydes contain nitrogen, while ketones only contain oxygen.
Answer: C
Study Note: The carbonyl group (C=O) in an aldehyde is terminal (attached to at least one H), while in a ketone, it is internal
(attached to two other carbon atoms).
Nomenclature
Q2: What is the IUPAC name for a three-carbon ketone?
A. Propanal
B. Propanone
C. Propanoic acid
D. Isopropanol
Answer: B
Study Note: The three-carbon alkane is propane. For a ketone, the suffix '-e' is replaced with '-one'. Propanone is also commonly
known as acetone.
Oxidation Reactions
Q3: Which of the following will occur when an aldehyde is treated with an oxidizing
agent like Tollens' reagent?
A. It is reduced to a primary alcohol.
B. It is oxidized to a carboxylic acid.
C. It is converted into a ketone.
D. No reaction occurs.
Answer: B
Study Note: Aldehydes are easily oxidized to carboxylic acids. Tollens' reagent (silver mirror test) is a classic test for the presence
of an aldehyde.
CHEM 219 Module 6 - Page 1
,Reduction Reactions
Q4: Reducing a ketone with NaBH4 (Sodium Borohydride) results in the formation of a:
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. Carboxylic acid
Answer: B
Study Note: Reduction of a ketone adds hydrogen across the C=O bond, resulting in a secondary alcohol. Reduction of an
aldehyde results in a primary alcohol.
Physical Properties
Q5: Aldehydes and ketones have lower boiling points than alcohols of similar mass
because:
A. They are non-polar.
B. They cannot form hydrogen bonds with each other.
C. They have higher molar masses.
D. They are gases at room temperature.
Answer: B
Study Note: Unlike alcohols, aldehydes and ketones do not have an H atom directly bonded to the oxygen, so they cannot form
intermolecular hydrogen bonds.
Functional Group Identification
Q6: What is the primary structural difference between an aldehyde and a ketone?
A. Aldehydes have a carbonyl group, ketones do not.
B. Ketones are at the end of a carbon chain, aldehydes are in the middle.
C. Aldehydes have the carbonyl carbon bonded to at least one hydrogen; ketones have it bonded to two
carbons.
D. Aldehydes contain nitrogen, while ketones only contain oxygen.
Answer: C
Study Note: The carbonyl group (C=O) in an aldehyde is terminal (attached to at least one H), while in a ketone, it is internal
(attached to two other carbon atoms).
Nomenclature
Q7: What is the IUPAC name for a three-carbon ketone?
A. Propanal
B. Propanone
C. Propanoic acid
D. Isopropanol
Answer: B
Study Note: The three-carbon alkane is propane. For a ketone, the suffix '-e' is replaced with '-one'. Propanone is also commonly
known as acetone.
CHEM 219 Module 6 - Page 2
,Oxidation Reactions
Q8: Which of the following will occur when an aldehyde is treated with an oxidizing
agent like Tollens' reagent?
A. It is reduced to a primary alcohol.
B. It is oxidized to a carboxylic acid.
C. It is converted into a ketone.
D. No reaction occurs.
Answer: B
Study Note: Aldehydes are easily oxidized to carboxylic acids. Tollens' reagent (silver mirror test) is a classic test for the presence
of an aldehyde.
Reduction Reactions
Q9: Reducing a ketone with NaBH4 (Sodium Borohydride) results in the formation of a:
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. Carboxylic acid
Answer: B
Study Note: Reduction of a ketone adds hydrogen across the C=O bond, resulting in a secondary alcohol. Reduction of an
aldehyde results in a primary alcohol.
Physical Properties
Q10: Aldehydes and ketones have lower boiling points than alcohols of similar mass
because:
A. They are non-polar.
B. They cannot form hydrogen bonds with each other.
C. They have higher molar masses.
D. They are gases at room temperature.
Answer: B
Study Note: Unlike alcohols, aldehydes and ketones do not have an H atom directly bonded to the oxygen, so they cannot form
intermolecular hydrogen bonds.
Functional Group Identification
Q11: What is the primary structural difference between an aldehyde and a ketone?
A. Aldehydes have a carbonyl group, ketones do not.
B. Ketones are at the end of a carbon chain, aldehydes are in the middle.
C. Aldehydes have the carbonyl carbon bonded to at least one hydrogen; ketones have it bonded to two
carbons.
D. Aldehydes contain nitrogen, while ketones only contain oxygen.
Answer: C
Study Note: The carbonyl group (C=O) in an aldehyde is terminal (attached to at least one H), while in a ketone, it is internal
(attached to two other carbon atoms).
CHEM 219 Module 6 - Page 3
, Nomenclature
Q12: What is the IUPAC name for a three-carbon ketone?
A. Propanal
B. Propanone
C. Propanoic acid
D. Isopropanol
Answer: B
Study Note: The three-carbon alkane is propane. For a ketone, the suffix '-e' is replaced with '-one'. Propanone is also commonly
known as acetone.
Oxidation Reactions
Q13: Which of the following will occur when an aldehyde is treated with an oxidizing
agent like Tollens' reagent?
A. It is reduced to a primary alcohol.
B. It is oxidized to a carboxylic acid.
C. It is converted into a ketone.
D. No reaction occurs.
Answer: B
Study Note: Aldehydes are easily oxidized to carboxylic acids. Tollens' reagent (silver mirror test) is a classic test for the presence
of an aldehyde.
Reduction Reactions
Q14: Reducing a ketone with NaBH4 (Sodium Borohydride) results in the formation of a:
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. Carboxylic acid
Answer: B
Study Note: Reduction of a ketone adds hydrogen across the C=O bond, resulting in a secondary alcohol. Reduction of an
aldehyde results in a primary alcohol.
Physical Properties
Q15: Aldehydes and ketones have lower boiling points than alcohols of similar mass
because:
A. They are non-polar.
B. They cannot form hydrogen bonds with each other.
C. They have higher molar masses.
D. They are gases at room temperature.
Answer: B
Study Note: Unlike alcohols, aldehydes and ketones do not have an H atom directly bonded to the oxygen, so they cannot form
intermolecular hydrogen bonds.
CHEM 219 Module 6 - Page 4
