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
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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
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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
B.
Decreases reactivity
C.
No effect
D.
Reactivity depends on solvent
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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 of ketones?
A.
-CHO
B.
-CO-
C.
-OH
D.
-NH2
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Solution
The functional group of ketones is -CO-, which is a carbonyl group between two carbon atoms.
Correct Answer:
B
— -CO-
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Q. What is the functional group present in ketones?
A.
-CHO
B.
-CO-
C.
-OH
D.
-C=O
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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
B.
CnH2n+2O
C.
CnH2n-2O
D.
CnH2nO2
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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
B.
Propanal
C.
Acetaldehyde
D.
Butanal
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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
B.
Butanal
C.
Propan-2-one
D.
Pentanal
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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
B.
4-oxobutanal
C.
2-oxobutanal
D.
2-butanone
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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?
A.
Propanal
B.
Butan-2-one
C.
Acetone
D.
Ethyl methyl ketone
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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
B.
Number of carbon atoms
C.
Presence of hydrogen
D.
All of the above
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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?
A.
Alcohol
B.
Ketone
C.
Carboxylic acid
D.
Alkane
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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?
A.
Benzyl alcohol
B.
Benzyl ketone
C.
Benzyl aldehyde
D.
Benzyl ether
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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?
A.
Sodium propan-2-one sulfonate
B.
Propan-2-ol
C.
Propan-2-one bisulfite adduct
D.
None of the above
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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?
A.
Aldol
B.
Acetal
C.
Ketone
D.
Carboxylic acid
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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?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Propan-1,2-diol
D.
Butan-2-ol
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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?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Propanoic acid
D.
Propane
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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?
A.
Aldehyde
B.
Ketone
C.
Carboxylic acid
D.
Alkane
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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?
A.
Iodoacetone
B.
Iodoform
C.
Bromoacetone
D.
Chloroacetone
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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
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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?
A.
Imine
B.
Amide
C.
Amino acid
D.
Alcohol
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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?
A.
Iodoform
B.
Bromoform
C.
Chloroform
D.
No reaction
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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
B.
C2H4O
C.
C4H8O
D.
C5H10O
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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
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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
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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
Show solution
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
Show solution
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
Show solution
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
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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
Show solution
Solution
Ketones cannot be oxidized further under normal conditions, unlike aldehydes and alcohols.
Correct Answer:
D
— Ketone
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Showing 1 to 30 of 54 (2 Pages)
Aldehydes & Ketones MCQ & Objective Questions
Aldehydes and ketones are crucial topics in organic chemistry that frequently appear in school and competitive exams. Understanding these compounds not only enhances your conceptual clarity but also boosts your confidence in tackling MCQs and objective questions. Practicing with relevant questions helps you identify important concepts and improves your exam preparation strategy.
What You Will Practise Here
Definitions and structural representations of aldehydes and ketones.
Key reactions involving aldehydes and ketones, including oxidation and reduction.
Functional group interconversions and their significance.
Mechanisms of nucleophilic addition reactions.
Important properties and applications of aldehydes and ketones.
Common derivatives and their formation.
Diagrams illustrating molecular structures and reaction pathways.
Exam Relevance
The topic of aldehydes and ketones is significant in various examinations such as CBSE, State Boards, NEET, and JEE. Students can expect questions that test their understanding of the properties, reactions, and applications of these compounds. Common question patterns include multiple-choice questions that require identification of functional groups, reaction mechanisms, and the ability to predict products of chemical reactions.
Common Mistakes Students Make
Confusing aldehydes with ketones due to their similar structures.
Overlooking the importance of functional groups in determining reactivity.
Misunderstanding the mechanisms of nucleophilic addition reactions.
Failing to recognize the significance of stereochemistry in reactions.
Neglecting to practice with diagrams, which can lead to errors in understanding reaction pathways.
FAQs
Question: What are the main differences between aldehydes and ketones?Answer: Aldehydes have a carbonyl group at the end of the carbon chain, while ketones have it within the chain. This structural difference affects their chemical properties and reactivity.
Question: How can I effectively prepare for aldehydes and ketones questions in exams?Answer: Focus on understanding the key concepts, practice MCQs regularly, and review your mistakes to strengthen your grasp of the topic.
Now is the time to enhance your understanding of aldehydes and ketones! Dive into practice MCQs and test your knowledge to excel in your exams.