Aldehydes & Ketones
Q. What is the functional group of aldehydes?
-
A.
-OH
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B.
-CHO
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C.
-C=O
-
D.
-COOH
Solution
The functional group of aldehydes is -CHO.
Correct Answer: B — -CHO
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Q. What is the IUPAC name of CH3CHO? (2023) 2023
-
A.
Acetaldehyde
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B.
Ethanal
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C.
Ethyl aldehyde
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D.
Methyl ketone
Solution
The IUPAC name of CH3CHO is ethanal, which is the simplest aldehyde.
Correct Answer: B — Ethanal
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Q. What is the main product when propan-2-one is treated with iodine in the presence of a base?
-
A.
Iodoform
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B.
Acetone
-
C.
Bromoform
-
D.
Chloroform
Solution
Propan-2-one (acetone) reacts with iodine in the presence of a base to form Iodoform.
Correct Answer: A — Iodoform
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Q. What is the molecular formula of butan-2-one?
-
A.
C4H8O
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B.
C4H10O
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C.
C4H6O
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D.
C4H12O
Solution
The molecular formula of butan-2-one is C4H8O.
Correct Answer: A — C4H8O
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Q. What is the molecular formula of formaldehyde?
-
A.
C2H4O
-
B.
CH2O
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C.
C3H6O
-
D.
C4H8O
Solution
The molecular formula of formaldehyde is CH2O.
Correct Answer: B — CH2O
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Q. What is the product of the oxidation of a primary alcohol? (2023) 2023
-
A.
Aldehyde
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B.
Ketone
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C.
Carboxylic acid
-
D.
Alkane
Solution
The oxidation of a primary alcohol results in the formation of an aldehyde.
Correct Answer: A — Aldehyde
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Q. What is the product of the oxidation of propan-2-ol?
-
A.
Propanal
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B.
Acetone
-
C.
Propanoic acid
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D.
Butan-2-one
Solution
Propan-2-ol oxidizes to form Acetone (CH3COCH3).
Correct Answer: B — Acetone
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Q. What is the product of the reaction between benzaldehyde and phenylmagnesium bromide?
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A.
Benzyl alcohol
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B.
Benzophenone
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C.
Diphenylmethanol
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D.
Benzene
Solution
The reaction produces Diphenylmethanol when benzaldehyde reacts with phenylmagnesium bromide.
Correct Answer: C — Diphenylmethanol
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Q. What is the simplest ketone?
-
A.
Acetaldehyde
-
B.
Acetone
-
C.
Butanone
-
D.
Propionaldehyde
Solution
Acetone (CH3COCH3) is the simplest ketone.
Correct Answer: B — Acetone
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Q. Which of the following compounds is a ketone? (2023) 2023
-
A.
Propanal
-
B.
Butanone
-
C.
Benzaldehyde
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D.
Ethanal
Solution
Butanone is a ketone, characterized by having the carbonyl group (C=O) between two carbon atoms.
Correct Answer: B — Butanone
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Q. Which of the following compounds is a product of the reaction between an aldehyde and a Grignard reagent?
-
A.
Alcohol
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B.
Ketone
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C.
Carboxylic acid
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D.
Ester
Solution
The reaction of an aldehyde with a Grignard reagent produces a primary alcohol.
Correct Answer: A — Alcohol
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Q. Which of the following is a common use of ketones?
-
A.
Solvents
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B.
Preservatives
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C.
Fragrances
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D.
All of the above
Solution
Ketones are commonly used as solvents, preservatives, and fragrances.
Correct Answer: D — All of the above
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Q. Which of the following is the functional group of aldehydes? (2023) 2023
-
A.
-CHO
-
B.
-CO-
-
C.
-C=O
-
D.
-OH
Solution
Aldehydes contain the functional group -CHO, which is characterized by a carbonyl group (C=O) bonded to a hydrogen atom.
Correct Answer: A — -CHO
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