Are these practice questions for Aldehydes, Ketones and Carboxylic Acids based on the CBSE pattern?

Yes. Every practice question is modeled on the CBSE Class 12 - Science Chemistry exam pattern — including MCQs, assertion-reason questions, and short-answer formats that frequently appear in CBSE papers.

Are the practice questions for Aldehydes, Ketones and Carboxylic Acids free?

Yes. Every chapter includes free practice questions for Class 12 - Science students to get you started.

What types of questions are included?

The practice set for Aldehydes, Ketones and Carboxylic Acids mainly includes MCQs and CBSE-style short-answer questions, with instant feedback on each answer. For full-length textbook practice, use the NCERT Solutions page.

Are the practice questions suitable for board exam preparation?

Yes. The questions test the same concepts and depth that CBSE asks in board exams. After finishing, also solve the NCERT and NCERT Exemplar exercises for Aldehydes, Ketones and Carboxylic Acids for full coverage.

How many practice questions are there for Aldehydes, Ketones and Carboxylic Acids?

The number scales with chapter length and concept density. Each chapter typically has 15-50 practice questions across MCQ and short-answer formats.

Aldehydes, Ketones and Carboxylic Acids Class 12 Chemistry Practice Questions with Answers

easy

Apply your understanding of reaction requirements to examine whether 2,2-Dimethylpropanal can undergo an Aldol condensation reaction. Justify your answer.

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easy

Name the product formed when a ketone reacts with a semicarbazide (

H_2N-NH-CO-NH_2

).

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easy

Identify the reagent commonly known as 'Tollens' reagent' and state its chemical composition.

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easy

Name the reaction used to prepare aldehydes from acyl chlorides using a palladium on barium sulphate catalyst.

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easy

Recall the IUPAC names for the following compounds: (i)

CH_3COCH_3

(Acetone), (ii)

HCHO

(Formaldehyde), (iii)

CH_3CH_2CHO

(Propionaldehyde).

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easy

Compare the electrophilicity of the carbonyl carbon in ethanal (

CH_3CHO

) versus propanone (

CH_3COCH_3

).

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easy

Justify why carboxylic acids have significantly higher boiling points than aldehydes and alcohols of comparable molecular mass.

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easy

Critique the use of sodium borohydride (

NaBH_4

) for the reduction of a carboxyl group to a primary alcohol.

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easy

Define the term 'carbonyl group' and list the functional groups where it is present.

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easy

Explain the term 'esterification' and write a general chemical equation for the reaction.

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easy

Compare the boiling point of propanal (

CH_3CH_2CHO

) and propan-1-ol (

CH_3CH_2CH_2OH

), which have comparable molecular masses, and analyze the reason for the difference.

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medium

Evaluate the statement: 'The Cannizzaro reaction is a disproportionation reaction.' Provide a suitable example and explain the oxidation and reduction processes.

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medium

Name the two reduction methods used to convert the carbonyl group of aldehydes and ketones into a methylene (

CH_2

) group.

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medium

List two electron-withdrawing groups and two electron-donating groups, and explain their effect on the acidity of carboxylic acids.

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medium

Identify the products formed when ethanal (

CH_3CHO

) undergoes Aldol condensation.

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medium

Demonstrate the mechanism for the nucleophilic addition of hydrogen cyanide (

HCN

) to propanone (

CH_3COCH_3

) in the presence of a basic catalyst (

OH^-

) to form a cyanohydrin.

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medium

Explain why carboxylic acids are more acidic than alcohols.

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medium

Evaluate the synthetic utility of the cross-aldol condensation between benzaldehyde and acetone. Predict the major product and justify why it is formed preferentially.

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medium

Describe the chemical test used to distinguish between aldehydes and ketones that involves ammoniacal silver nitrate solution.

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medium

Apply IUPAC nomenclature rules to provide the systematic name for the compound with the structure

CH_3CH(Br)CH_2COCH(CH_3)_2

.

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medium

Solve for the major organic product when benzoyl chloride (

C_6H_5COCl

) is treated with hydrogen gas over a palladium catalyst supported on barium sulphate (

Pd/BaSO_4

). Also, identify this named reaction.

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medium

Design a chemical test to distinguish between pentan-2-one and pentan-3-one. Write the chemical equations for the positive test.

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medium

Propose a reason why the Hell-Volhard-Zelinsky reaction specifically halogenates the

\alpha

-carbon of a carboxylic acid and not other positions.

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medium

Propose why Friedel-Crafts acylation is preferred over Friedel-Crafts alkylation for preparing aryl ketones like acetophenone.

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medium

Solve for the final organic product when butanoic acid (

CH_3CH_2CH_2COOH

) is subjected to the Hell-Volhard-Zelinsky reaction using bromine (

Br_2

) and red phosphorus, followed by hydrolysis.

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medium

Justify why p-nitrobenzoic acid (

pK_a = 3.41

) is a stronger acid than benzoic acid (

pK_a = 4.19

), which in turn is stronger than p-methoxybenzoic acid (

pK_a = 4.46

).

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medium

Explain why the boiling points of aldehydes and ketones are higher than those of nonpolar hydrocarbons of similar molecular mass.

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medium

Design a multi-step synthesis to prepare benzene-1,4-dicarboxylic acid (terephthalic acid) starting from p-xylene.

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medium

Justify why ketones are generally less reactive than aldehydes towards nucleophilic addition reactions, considering both steric and electronic factors.

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medium

Define the Cannizzaro reaction and state the necessary condition for an aldehyde to undergo this reaction.

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medium

A student attempts to prepare an ester by reacting a carboxylic acid with an alcohol in a neutral medium and observes a very low yield. Critique this approach and propose a modification to improve the reaction's efficiency, explaining the role of the proposed reagent.

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medium

Compare and contrast the chemical principles and observations of Tollens' test and Fehling's test.

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medium

Examine the acid-catalyzed esterification reaction. Explain why the reaction is reversible and apply Le Chatelier's principle to suggest two distinct methods for increasing the yield of the ester.

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medium

Analyze the acidity of fluoroacetic acid (

FCH_2COOH

) and chloroacetic acid (

ClCH_2COOH

). Which one is the stronger acid and why?

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hard

Describe the Hell-Volhard-Zelinsky (HVZ) reaction.

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hard

Apply your knowledge of electrophilic aromatic substitution to devise a two-step synthesis for converting benzene into m-Nitroacetophenone.

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hard

Analyze why formaldehyde (

HCHO

) undergoes the Cannizzaro reaction in the presence of concentrated alkali, whereas ethanal (

CH_3CHO

) undergoes the Aldol condensation. Demonstrate the products formed when formaldehyde undergoes this reaction.

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hard

Design a synthetic pathway to convert toluene into 3-phenylpropan-1-ol in not more than four steps. Justify the choice of reagents for each step.

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hard

An organic compound (A) with the molecular formula

C_8H_8O

gives a positive 2,4-DNP test. It does not react with Tollens' reagent but gives a yellow precipitate with iodine and sodium hydroxide. Upon vigorous oxidation, it produces benzoic acid (

C_6H_5COOH

). Solve for the structure of compound (A) and demonstrate the key reactions.

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hard

Solve for the structures of the four possible aldol addition products formed when a mixture of ethanal (

CH_3CHO

) and propanal (

CH_3CH_2CHO

) is treated with dilute

NaOH

.

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hard

An unknown organic compound (A) with molecular formula

C_8H_8O

forms an orange-red precipitate with 2,4-DNP reagent and gives a yellow precipitate on heating with iodine and NaOH. It does not reduce Tollens' reagent. On drastic oxidation, it gives a carboxylic acid (B) with molecular formula

C_7H_6O_2

. Create a reaction scheme to identify compounds (A) and (B) and justify each inference.

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hard

Analyze the following compounds and arrange them in increasing order of their reactivity towards nucleophilic addition reactions: Propanone, Ethanal, Benzaldehyde, Acetophenone. Provide a detailed justification for your arrangement.

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hard

Justify the meta-directing nature of the carbonyl group in benzaldehyde during electrophilic aromatic substitution, such as nitration. Draw resonance intermediates for ortho, meta, and para attack to support your reasoning.

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hard

Formulate a plausible mechanism for the acid-catalyzed formation of an acetal from ethanal and excess ethanol.

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hard

Summarize the key steps in the preparation of a carboxylic acid from a Grignard reagent.

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Aldehydes, Ketones and Carboxylic AcidsClass 12 Chemistry Practice Questions