Aldehydes & Ketones
Q. What is the effect of increasing the carbon chain length on the boiling point of aldehydes?
-
A.
Decreases
-
B.
Increases
-
C.
Remains the same
-
D.
Varies randomly
Solution
The boiling point of aldehydes increases with the increase in carbon chain length due to increased van der Waals forces.
Correct Answer: B — Increases
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Q. What is the effect of increasing the number of carbon atoms in aldehydes on their boiling points?
-
A.
Decreases
-
B.
Increases
-
C.
Remains constant
-
D.
Varies unpredictably
Solution
The boiling points of aldehydes increase with the number of carbon atoms due to increased van der Waals forces.
Correct Answer: B — Increases
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Q. What is the effect of increasing the steric hindrance on the reactivity of aldehydes and ketones?
-
A.
Increases reactivity
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B.
Decreases reactivity
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C.
No effect
-
D.
Reactivity depends on solvent
Solution
Increasing steric hindrance decreases the reactivity of ketones compared to aldehydes.
Correct Answer: B — Decreases reactivity
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Q. What is the functional group present in ketones?
-
A.
-CHO
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B.
-CO-
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C.
-OH
-
D.
-C=O
Solution
Ketones contain the functional group -CO- (carbonyl group) between two carbon atoms.
Correct Answer: B — -CO-
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Q. What is the general formula for ketones?
-
A.
CnH2nO
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B.
CnH2n+2O
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C.
CnH2n-2O
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D.
CnH2nO2
Solution
The general formula for ketones is CnH2nO, where n is the number of carbon atoms.
Correct Answer: A — CnH2nO
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Q. What is the IUPAC name of CH3CHO?
-
A.
Ethanal
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B.
Propanal
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C.
Acetaldehyde
-
D.
Butanal
Solution
The IUPAC name of CH3CHO is ethanal, which is also known as acetaldehyde.
Correct Answer: A — Ethanal
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Q. What is the IUPAC name of CH3COCH2CH3?
-
A.
Butan-2-one
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B.
Butanal
-
C.
Propan-2-one
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D.
Pentanal
Solution
The IUPAC name of CH3COCH2CH3 is Butan-2-one, as it has a ketone functional group at the second carbon.
Correct Answer: A — Butan-2-one
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Q. What is the IUPAC name of CH3COCH2CHO?
-
A.
3-oxobutanal
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B.
4-oxobutanal
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C.
2-oxobutanal
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D.
2-butanone
Solution
The IUPAC name of CH3COCH2CHO is 3-oxobutanal.
Correct Answer: A — 3-oxobutanal
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Q. What is the IUPAC name of CH3COCH3?
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A.
Propanal
-
B.
Butan-2-one
-
C.
Acetone
-
D.
Ethyl methyl ketone
Solution
CH3COCH3 is known as acetone, which is the simplest ketone.
Correct Answer: C — Acetone
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Q. What is the main difference between aldehydes and ketones?
-
A.
Position of the carbonyl group
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B.
Number of carbon atoms
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C.
Presence of hydrogen
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D.
All of the above
Solution
The main difference is the position of the carbonyl group; aldehydes have it at the end of the carbon chain, while ketones have it within the chain.
Correct Answer: A — Position of the carbonyl group
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Q. What is the main product when an aldehyde reacts with a Grignard reagent?
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A.
Alcohol
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B.
Ketone
-
C.
Carboxylic acid
-
D.
Alkane
Solution
The reaction of an aldehyde with a Grignard reagent produces a primary alcohol after hydrolysis.
Correct Answer: A — Alcohol
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Q. What is the main product when benzaldehyde is treated with Grignard reagent followed by hydrolysis?
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A.
Benzyl alcohol
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B.
Benzyl ketone
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C.
Benzyl aldehyde
-
D.
Benzyl ether
Solution
The reaction of benzaldehyde with Grignard reagent followed by hydrolysis yields benzyl alcohol.
Correct Answer: A — Benzyl alcohol
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Q. What is the main product when propan-2-one is treated with sodium bisulfite?
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A.
Sodium propan-2-one sulfonate
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B.
Propan-2-ol
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C.
Propan-2-one bisulfite adduct
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D.
None of the above
Solution
The main product is the propan-2-one bisulfite adduct.
Correct Answer: C — Propan-2-one bisulfite adduct
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Q. What is the main product when propanal is treated with excess alcohol in the presence of an acid catalyst?
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A.
Aldol
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B.
Acetal
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C.
Ketone
-
D.
Carboxylic acid
Solution
When propanal is treated with excess alcohol in the presence of an acid catalyst, an acetal is formed.
Correct Answer: B — Acetal
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Q. What is the main product when propanal is treated with excess Grignard reagent followed by hydrolysis?
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A.
Propan-1-ol
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B.
Propan-2-ol
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C.
Propan-1,2-diol
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D.
Butan-2-ol
Solution
The reaction of propanal with excess Grignard reagent followed by hydrolysis yields propan-2-ol.
Correct Answer: B — Propan-2-ol
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Q. What is the main product when propanal is treated with excess hydrogen in the presence of a catalyst?
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A.
Propan-1-ol
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B.
Propan-2-ol
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C.
Propanoic acid
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D.
Propane
Solution
Propanal is reduced to propan-1-ol when treated with excess hydrogen in the presence of a catalyst.
Correct Answer: A — Propan-1-ol
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Q. What is the product of the oxidation of a primary alcohol?
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A.
Aldehyde
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B.
Ketone
-
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 reaction between acetone and iodine in the presence of a base?
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A.
Iodoacetone
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B.
Iodoform
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C.
Bromoacetone
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D.
Chloroacetone
Solution
The product is Iodoform, formed from the reaction of acetone with iodine in the presence of a base.
Correct Answer: B — Iodoform
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Q. What is the product of the reaction between an aldehyde and a Grignard reagent?
-
A.
Alcohol
-
B.
Ketone
-
C.
Carboxylic acid
-
D.
Alkane
Solution
The reaction between an aldehyde and a Grignard reagent produces a secondary alcohol after hydrolysis.
Correct Answer: A — Alcohol
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Q. What is the product of the reaction between an aldehyde and a primary amine?
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A.
Imine
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B.
Amide
-
C.
Amino acid
-
D.
Alcohol
Solution
The reaction between an aldehyde and a primary amine produces an imine.
Correct Answer: A — Imine
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Q. What is the product when propan-2-one reacts with iodine in the presence of a base?
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A.
Iodoform
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B.
Bromoform
-
C.
Chloroform
-
D.
No reaction
Solution
Propan-2-one reacts with iodine in the presence of a base to form iodoform (CHI3).
Correct Answer: A — Iodoform
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Q. Which of the following compounds can be classified as a ketone?
-
A.
C3H6O
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B.
C2H4O
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C.
C4H8O
-
D.
C5H10O
Solution
C3H6O (acetone) is a ketone, characterized by the carbonyl group (C=O) between two carbon atoms.
Correct Answer: A — C3H6O
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Q. Which of the following compounds can be distinguished from aldehydes using Tollen's reagent?
-
A.
Acetone
-
B.
Formaldehyde
-
C.
Benzaldehyde
-
D.
Propionaldehyde
Solution
Tollen's reagent can oxidize aldehydes but not ketones. Acetone is a ketone and will not react.
Correct Answer: A — Acetone
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Q. Which of the following compounds can be formed by the reaction of an aldehyde with a Grignard reagent?
-
A.
Alcohol
-
B.
Carboxylic acid
-
C.
Ketone
-
D.
Ester
Solution
The reaction of an aldehyde with a Grignard reagent forms a primary alcohol after hydrolysis.
Correct Answer: A — Alcohol
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Q. Which of the following compounds can be reduced to an alcohol using NaBH4?
-
A.
Aldehyde
-
B.
Ketone
-
C.
Both Aldehyde and Ketone
-
D.
None of the above
Solution
Both aldehydes and ketones can be reduced to their corresponding alcohols using sodium borohydride (NaBH4).
Correct Answer: C — Both Aldehyde and Ketone
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Q. Which of the following compounds can be reduced to an alcohol?
-
A.
Aldehyde
-
B.
Ketone
-
C.
Both Aldehyde and Ketone
-
D.
None of the above
Solution
Both aldehydes and ketones can be reduced to their corresponding alcohols.
Correct Answer: C — Both Aldehyde and Ketone
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Q. Which of the following compounds can be used to distinguish between aldehydes and ketones?
-
A.
Benedict's solution
-
B.
Tollens' reagent
-
C.
Fehling's solution
-
D.
All of the above
Solution
Tollens' reagent can be used to distinguish aldehydes from ketones, as it oxidizes aldehydes but not ketones.
Correct Answer: B — Tollens' reagent
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Q. Which of the following compounds can undergo aldol condensation?
-
A.
Acetone
-
B.
Benzaldehyde
-
C.
Formaldehyde
-
D.
Ethyl acetate
Solution
Acetone can undergo aldol condensation due to the presence of alpha-hydrogens.
Correct Answer: A — Acetone
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Q. Which of the following compounds cannot be oxidized?
-
A.
Aldehyde
-
B.
Primary alcohol
-
C.
Secondary alcohol
-
D.
Ketone
Solution
Ketones cannot be oxidized further under normal conditions, unlike aldehydes and alcohols.
Correct Answer: D — Ketone
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Q. Which of the following compounds is an aldehyde?
-
A.
C2H5OH
-
B.
CH3CHO
-
C.
C3H6O
-
D.
C6H12O6
Solution
The compound CH3CHO is an aldehyde, characterized by the presence of the -CHO functional group.
Correct Answer: B — CH3CHO
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