NCERT Class 12 Chemistry Chapter 8: Aldehydes, Ketones, and Carboxylic Acids MCQs & PYQs

Chapter 8 of NCERT Class 12 Chemistry explores aldehydes, ketones, and carboxylic acids, which are vital functional groups in organic chemistry. This chapter covers their properties, nomenclature, methods of preparation, and reactions, including important organic reactions like oxidation and reduction. Understanding these compounds is crucial for both theoretical knowledge and practical applications in industries like pharmaceuticals, food, and perfumes.

This article includes essential resources for Class 12 Chemistry Chapter 8, such as multiple-choice questions (MCQs), previous year questions (PYQs), and downloadable PDFs of Class 12 Chemistry Chapter 8 MCQs and previous year questions.

NCERT Class 12 Chemistry Chapters
Chapter 1: Solutions	Chapter 2: Electrochemistry
Chapter 3: Chemical Kinetics	Chapter 4: The d- and f-Block Elements
Chapter 5: Coordination Compounds	Chapter 6: Haloalkanes and Haloarenes
Chapter 7: Alcohols, Phenols and Ethers	Chapter 9: Amines
Chapter 10: Biomolecules

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Class 12 Chemistry Chapter 8 MCQs

This section includes multiple-choice questions (MCQs) from previous years and expert-curated questions designed for Class 12 Chemistry Chapter 8: Aldehydes, Ketones, and Carboxylic Acids. Below are 5 sample questions, with a link to download the full set of MCQs in PDF format.

1.	This reaction is known as: (a) Cannizzaro reaction (b) Etard reaction (c) Rosenmund reduction (d) Aldol condensation
2.	Which of the following reagents would one choose to transform CH₃COCl into acetone? (a) (CH₃)₂Cd (b) CH₃MgBr (c) CH₃Cl (d) (CH₃O)₂Mg
3.	Which of the following is an ‘Acetal’? (a) CH₃ CH₂ – OCH₃(b) (c) (d)
4.	Assertion (A): Oxidation of ketones is easier than aldehydes. Reason (R): C-C bond of ketones is stronger than C-H bond of aldehydes. (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A). (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). (c) Assertion (A) is correct, but Reason (R) is wrong statement. (d) Assertion (A) is wrong, but Reason (R) is correct statement.
5.	A compound (A) with molecular formula C₅H₁₀O, forms a phenyl hydrazone and gives negative Tollen’s and iodoform tests. The compound on reduction gives n-pentane. The compound (A) is : (a) Pentan-3-one (b) Pentanal (c) Pentanol (d) Pentan-2-one

Class 12 Chemistry Chapter 8 Subjective Questions Without Solutions

Here are 5 sample subjective questions based on previous years' CBSE exams (2 marks and above) for Class 12 Chemistry Chapter 8: Aldehydes, Ketones, and Carboxylic Acids. For the full set of subjective questions, download the PDF.

1.	(a) Draw structure of the 2, 4-dinitrophenylhydrazone of benzaldehyde. (b) Which acid of the following pair is a stronger acid? (c) Write the chemical equation involved in Rosennmund reaction (d) Why are -hydrogen atoms of aldehydes and ketones acidic in nature? (e) Write a chemical test to distinguish between Benzaldehyde and Benzoic acid. (CBSE 2023, 5M)
2.	Write the equation involved in the following reactions : (i) Rosenmund reduction (ii) Etard reaction (iii) Stephen reaction (CBSE 2022, 3M)
3.	(a) Give reasons : Benzoic acid is a stronger acid than acetic acid. Methanal is more reactive towards nucleophilic addition reaction than ethanal. (b) Give a simple chemical test to distinguish between propanal and propanone. (CBSE 2019, 3M)
4.	Write the main product formed when propanal reacts with the following reagents : 2 moles of CH₃OH in presence of dry HCl Dilute NaOH H₂N – NH₂ followed by heating with KOH in ethylene glycol Arrange the following compounds in increasing order of their property as indicated: F – CH₂COOH, O₂N – CH₂COOH, CH₃COOH, HCOOH — acid character Acetone, Acetaldehyde, Benzaldehyde, Acetophenone — reactivity towards addition of HCN (CBSE 2019, 5M)
5.	Give IUPAC name of Salicylic acid. Chloroacetic acid is more acidic than acetic acid. Why? Write the products formed when (CH₃)₃C–CHO reacts with the following : Zinc amalgam and dilute hydrochloric acid Concentrated sodium hydroxide solution Semicarbazide and a weak acid (CBSE 2019, 5M)

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Science Subjects Table

Sub Topics of Chapter 8: Aldehydes, Ketones and Carboxylic Acids

Chapter Name	Sub Topics of Chapter 8: Aldehydes, Ketones and Carboxylic Acids
Aldehydes, Ketones, and Carboxylic Acids	8.1 Introduction to Aldehydes and Ketones
	8.2 Methods of Preparation of Aldehydes and Ketones
	8.3 Reactions of Aldehydes and Ketones
	8.4 Carboxylic Acids and Their Properties
	8.5 Methods of Preparation and Reactions of Carboxylic Acids

Review of NCERT Class 12 Chemistry Chapter 8

Aldehydes, Ketones, and Carboxylic Acids (Chapter 8) is a fundamental chapter in Class 12 Chemistry, covering three important functional groups in organic chemistry. The chapter provides in-depth insights into their properties, synthesis methods, and reactions.

Students explore various methods for preparing aldehydes and ketones, such as the oxidation of primary alcohols to aldehydes and the reduction of carboxylic acids to aldehydes or alcohols. The reactivity of these compounds, including nucleophilic addition to aldehydes and electrophilic substitution in carboxylic acids, forms the core of the chapter. Students also study the synthesis and reactions of carboxylic acids, along with their important derivatives.

This chapter is crucial for understanding organic synthesis, as aldehydes, ketones, and carboxylic acids are building blocks in the formation of other organic compounds. The knowledge gained in this chapter has applications in industries, pharmaceuticals, and biochemistry.

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