Aldehydes & Ketones — JEE Main PYQs & Practice Questions

Aldehydes & Ketones is a Chemistry chapter in the JEE Main syllabus. This page brings together 78 previous-year and practice questions on Aldehydes & Ketones, organised into 5 topics: Preparation of Aldehydes and Ketones, Nucleophilic Addition Reactions, Aldol Condensation, Oxidation and Reduction and Cannizzaro Reaction. Most questions come with a step-by-step solution you can work through free in PrepWiser.

Download Aldehydes & Ketones JEE Main PYQs as a free PDF (with answer key)

Revise this chapter: Revision notes · Formula sheet

Chapter weightage: how many questions each chapter had per shift in the 2024–26 papers.

Preparation of Aldehydes and Ketones

• 'A' and 'B' in the following reactions are :
• The correct sequence of reagents for the above conversion of X to Y is :
• This reduction reaction is known as:
• R-CN →((i)DIBAL-H)R-Y Consider the above reaction and identify "Y"
• Match List - I with List - II. List – I Reagents | List – II Reaction Name (Involving…
• Match List I with List II LIST I Name of reaction | LIST II Reagent used; A. |…
• Given below are two statements for the following reaction sequence. Statement I…
• Which of the following reaction is NOT correctly represented?
• Which one of the following reactions will not form acetaldehyde?
• A →(Hydrolysis) B B reacts with Hydroxyl amine but does not give Tollen's test. Identify…
• Match List - I with List - II : List - I, List - II; (Chemical Reaction), (Reagent…
• Both acetaldehyde and acetone (individually) undergo which of the following reactions?…
• A student is given one compound among the following compounds that gives positive test…
• An optically active alkyl bromide C₄H₉Br, reacts with ethanolic KOH to form major…
• Consider the following two reactionsA andB. Numerical value of [molar mass of x+ molar…
• A reaction of benzonitrile with one equivalent CH₃MgBr followed by hydrolysis produces a…
• The reagent, from the following, which converts benzoic acid to benzaldehyde in one step…
• Which of the following conditions or reaction sequence will NOT give acetophenone as the…
• Oxidation of toluene to benzaldehyde can be easily carried out with which of the…
• Which of the following reactions will yield benzaldehyde as a product?

Nucleophilic Addition Reactions

• The number of stereoisomers formed in a reaction of (±)Ph(C=O) C(OH)(CN) Ph with HCN is…
• The major product of the above reactions is :
• Which among the following aldehydes is most reactive towards nucleophilic addition…
• Among the following, the number of compounds which will give positive iodoform reaction…
• Given below are two statements: Statement I : The condensation reaction between CH₃-CH=O…
• The increasing order of the reactivity of the following compound in nucleophilic…
• Which of the following ketone will NOT give enamine on treatment with secondary amines?…
• Given below are two statements : Statement I : The nucleophilic addition of sodium…
• The increasing order of the following compounds towards HCN addition is :
• The compound formed by the reaction of ethanal with semicarbazide contains _________…
• Consider the given reaction, identify 'X' and 'Y' :
• Which of the following arrangements with respect to their reactivity in nucleophilic…
• Aldehydes are more reactive than ketones towards nucleophilic addition.
• The number of nitrogen atoms in a semicarbazone molecule of acetone is ______________.
• Given below are two statements : one is labelled as Assertion A and the other is…
• An organic compound " P " of molecular formula C₆H₁₂O₃ gives positive Iodoform test but…
• A molecule (X) with following structure under mild acidic condition is hydrolysed to…
• The product of reaction of acetone with HCN is:
• Given below are two statements: Consider the following reaction R-C(∥)(O)-R + H₂O ⇌(K)…

Aldol Condensation

• In the given reaction, The number of π electrons present in the product 'P' is _________.
• Consider the following reaction of benzene. In compound (Q), the percentage of oxygen is…
• Cyclohexylamine when treated with nitrous acid yields (P). On treating (P) with PCC…
• Aldol condensation is a popular and classical method to prepare α, β-unsaturated…
• ' x ' is the product which is obtained from propanenitrile and stannous chloride in the…
• Given below are two statements : Statement I : Cross aldol condensation between two…
• "P" is a hydrocarbon of molecular formula:- C₈H₁₄. On ozonolysis, "P" forms "Q". "Q" on…
• Cross-aldol condensation between acetaldehyde and acetone gives:
• The product of aldol condensation of acetaldehyde is:
• Consider the following reaction sequence: The product 'B' is :
• Aldol condensation requires base catalyst.
• Isobutyraldehyde on reaction with formaldehyde and K₂CO₃ gives compound 'A'. Compound…
• When undergoes intramolecular aldol condensation, the major product formed is :
• Given below are two statements: Statement I : Vanilin will react with NaOH and also with…
• ' x ' is the product which is obtained from benzene by reacting it with carbon monoxide…
• Two moles of benzaldehyde and one mole of acetone under alkaline conditions using…
• Aman has been asked to synthesise the molecule He thought of preparing the molecule…
• Compound (X) undergoes following sequence of reactions to give the Lactone (Y).
• Given below are two statements : Statements I : Acidity of α-hydrogens of aldehydes and…
• ' x ' is the product which is obtained by the hydrolysis of prop-1-yne in the presence…

Oxidation and Reduction

• Which of the following statements are TRUE about Haloform reaction? A. Sodium…
• Number of molecules from below which cannot give iodoform reaction is : Ethanol…
• The number of molecules which gives the haloform test among the following molecules is…
• Hex-4-ene-2-ol on treatment with PCC gives 'A'. 'A' on reaction with sodium hypoiodite…
• CH₃ - CH₂ - CN→ _(Ether)^(CH₃MgBr) A→(H₃O +) B→ _(HCl)^(Zn - Hg) C The correct structure…
• Which among the following compounds give yellow solid when reacted with NaOI / NaOH ?…
• In Tollen's test for aldehyde, the overall number of electron(s) transferred to the…
• Match the LIST-I with LIST-II List-I Reagents | List-II Name of Reaction involving…
• Experimentally reducing a functional group cannot be done by which one of the following…
• Which reagent converts aldehydes to primary alcohols?
• Given below are two statements: One is labelled as Assertion A and the other is labelled…

Cannizzaro Reaction

• m-chlorobenzaldehyde on treatment with 50% KOH solution yields :
• The major product of the following reaction is : CH₃ CH₂ CH=O →(excess HCHO alkali) ?
• The compound A,C₈H₈O₂ reacts with acetophenone to form a single product via cross-Aldol…
• An organic compound “x” where molar ratio of C, O and H are equal, on treatment with 50%…

More Chemistry chapters

• Mole Concept & Stoichiometry
• Atomic Structure
• Gaseous State
• Chemical Thermodynamics
• Chemical Equilibrium
• Ionic Equilibrium
• Redox Reactions
• Solutions & Colligative Properties
• Electrochemistry
• Chemical Kinetics
• Solid State
• Surface Chemistry
• Nuclear & Radiochemistry
• Periodic Table & Periodicity
• Chemical Bonding & Molecular Structure
• Hydrogen & s-Block Elements
• p-Block Elements — Part I (Group 13 & 14)
• Environmental Chemistry
• p-Block Elements — Part II (Group 15-18)
• d & f Block Elements
• Coordination Compounds
• Metallurgy
• Qualitative Analysis — Salt Analysis
• Purification & Characterisation of Organic Compounds
• General Organic Chemistry (GOC)
• Hydrocarbons — Alkanes
• Hydrocarbons — Alkenes & Alkynes
• Hydrocarbons — Aromatic (Arenes)
• Halogen Derivatives — Haloalkanes & Haloarenes
• Alcohols, Phenols & Ethers
• Carboxylic Acids & Their Derivatives
• Amines & Diazonium Salts
• Carbohydrates & Biomolecules
• Polymers
• Chemistry in Everyday Life
• Practical Organic Chemistry

Frequently asked questions

How many Aldehydes & Ketones questions are there for JEE Main?

PrepWiser has 78 Aldehydes & Ketones questions for JEE Main, grouped into 5 topics such as Preparation of Aldehydes and Ketones, Nucleophilic Addition Reactions and Aldol Condensation.

Are these Aldehydes & Ketones questions from previous-year JEE Main papers?

Yes — most are genuine previous-year questions from past JEE Main papers, and the rest are practice questions written to match the JEE Main pattern and difficulty.

Where can I see the answers and solutions to these Aldehydes & Ketones questions?

Open any Aldehydes & Ketones question in PrepWiser (it is free) to attempt it; most come with a step-by-step solution.