Q. What is the boiling point trend among aldehydes, ketones, and carboxylic acids?
-
A.
Aldehydes > Ketones > Carboxylic Acids
-
B.
Carboxylic Acids > Aldehydes > Ketones
-
C.
Ketones > Carboxylic Acids > Aldehydes
-
D.
All have the same boiling point
Solution
Carboxylic acids have the highest boiling points due to hydrogen bonding, followed by aldehydes and then ketones.
Correct Answer:
B
— Carboxylic Acids > Aldehydes > Ketones
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Q. What is the IUPAC name of CH3CHO?
-
A.
Ethanal
-
B.
Propanal
-
C.
Butanal
-
D.
Methanal
Solution
The compound CH3CHO is an aldehyde with the IUPAC name Ethanal.
Correct Answer:
A
— Ethanal
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Q. What is the molecular formula of butanoic acid?
-
A.
C4H8O2
-
B.
C4H6O2
-
C.
C4H10O2
-
D.
C4H12O2
Solution
The molecular formula of butanoic acid is C4H8O2.
Correct Answer:
A
— C4H8O2
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Q. What is the product when propan-2-one is reduced?
-
A.
Propan-1-ol
-
B.
Propan-2-ol
-
C.
Propan-3-ol
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D.
Butan-2-ol
Solution
The reduction of propan-2-one yields propan-2-ol.
Correct Answer:
B
— Propan-2-ol
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Q. Which of the following compounds is a ketone?
-
A.
CH3COCH3
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B.
C2H5CHO
-
C.
C3H7COOH
-
D.
C4H9OH
Solution
CH3COCH3 is a ketone, specifically known as Acetone.
Correct Answer:
A
— CH3COCH3
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Q. Which of the following is a characteristic reaction of carboxylic acids?
-
A.
Formation of esters
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B.
Reduction to alcohols
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C.
Dehydration to alkenes
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D.
Oxidation to ketones
Solution
Carboxylic acids can react with alcohols to form esters, a characteristic reaction.
Correct Answer:
A
— Formation of esters
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Q. Which of the following is a common method for synthesizing aldehydes?
-
A.
Hydration of alkenes
-
B.
Oxidation of primary alcohols
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C.
Reduction of carboxylic acids
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D.
Dehydration of alcohols
Solution
Aldehydes can be synthesized by the oxidation of primary alcohols.
Correct Answer:
B
— Oxidation of primary alcohols
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Q. Which of the following is the correct structure for a ketone?
-
A.
RCHO
-
B.
RCOOR'
-
C.
RC(=O)R'
-
D.
RCOOH
Solution
The structure RC(=O)R' represents a ketone.
Correct Answer:
C
— RC(=O)R'
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Q. Which reagent is commonly used to distinguish between aldehydes and ketones?
-
A.
Benedict's solution
-
B.
Tollens' reagent
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C.
Fehling's solution
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D.
All of the above
Solution
Tollens' reagent is commonly used to distinguish between aldehydes and ketones.
Correct Answer:
B
— Tollens' reagent
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