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Chemistry - Aldehydes and Ketones

Practise 169 JEE Main previous year questions on Aldehydes and Ketones, compiled from papers spanning 2002 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Main tests.

Aldehydes and Ketones has been asked in 20 of the 25 years of JEE Main papers analysed (2002–2026), with 169 questions in all. 18% of them were easy, 50% moderate and 31% tough. Most of its questions came from 2021, with 25 questions that year. In the last three years (2024–2026) it had 46 questions across 49 papers, about 0.9 per paper.

The chapter's 6 topics are not weighted equally: Chemical reactions for aldehydes and ketones (91 questions, 54%), Tests for aldehyde and ketones (30 questions, 18%), and Method of preparation for both aldehydes and ketones (25 questions, 15%) have been asked the most. Chemical reactions for aldehydes and ketones has also led over the last five years, with 47 questions. Chemical reactions for aldehydes and ketones has produced the most tough questions (34).

  1. 1Consider the following reaction. The major product (P) formed is:08 Apr, 2026 (E)Chemical reactions for aldehydes and ketones
  2. 2' ' is the product which is obtained from benzene by reacting it with carbon monoxide and hydrogen chloride in the presence of cuprous chlor08 Apr, 2026 (E)Method of preparation for both aldehydes and ketones
  3. 3' ' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at K. '06 Apr, 2026 (E)Chemical reactions for aldehydes and ketones
  4. 4Given below are two statements: Statement-I: The condensation reaction between and under optimum pH will produce . Statement-II: The molecul05 Apr, 2026 (E)Chemical reactions for aldehydes and ketones
  5. 5An organic compound " " where molar ratio of C, O and H are equal, on treatment with KOH under reflux followed by acidification produced " "02 Apr, 2026 (E)Chemical reactions for aldehydes and ketones
  6. 6Given below are the four isomeric compounds Identify correct statements from below. A. and S will give precipitate with . B. P and Q will gi28 Jan, 2026 (M)Tests for aldehyde and ketones
  7. 7Given below are two statements: Statement I : Cross aldol condensation between two different aldehydes will always produce four different pr24 Jan, 2026 (E)Chemical reactions for aldehydes and ketones
  8. 8' ' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. 23 Jan, 2026 (M)Chemical reactions for aldehydes and ketones
  9. 9Which of the following statements are TRUE about Haloform reaction?: A. Sodium hypochlorite reacts with KI to give KOI. B. KOI is a reducing23 Jan, 2026 (E)Tests for aldehyde and ketones
  10. 10Iodoform test can differentiate between A. Methanol and Ethanol B. and C. Cyclohexene and cyclohexanone D. Diethyl ether and Pentan-3-one E.23 Jan, 2026 (E)Tests for aldehyde and ketones
  11. 11Match the LIST-I with LIST-II \( {array}{|c|l|c|l|} & {List-I (Reagents)} & & {List-II (Name of reaction} \\ & & & {involving carbonyl compo22 Jan, 2026 (M)Tests for aldehyde and ketones
  12. 12The compound A, reacts with acetophenone to form a single product via cross-Aldol condensation. The compound A on reaction with conc. NaOH f22 Jan, 2026 (E)Chemical reactions for aldehydes and ketones
  13. 13An organic compound " P " of molecular formula gives positive Iodoform test but negative Tollen's test. When " P " is treated with dilute ac21 Jan, 2026 (M)Tests for aldehyde and ketones
  14. 14Match List - I with List - II. Choose the correct answer from the options given below :21 Jan, 2026 (E)Method of preparation for Aldehydes
  15. 15Preview not available - open to view this question.08 Apr, 2025 (E)Chemical reactions for aldehydes and ketones
  16. 16"P" is an optically active compound with molecular formula . When " P " is treated with 2,4-dinitrophenylhydrazine, it gives a positive test07 Apr, 2025 (E)Tests for aldehyde and ketones
  17. 17Aldol condensation is a popular and classical method to prepare -unsaturated carbonyl compounds. This reaction can be both intermolecular an04 Apr, 2025 (M)Chemical reactions for aldehydes and ketones
  18. 18Which among the following compounds give yellow solid when reacted with ? Choose the correct answer from the options given below :04 Apr, 2025 (E)Tests for aldehyde and ketones
  19. 19Number of molecules from below which cannot give ioddoform reaction is : Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Bu03 Apr, 2025 (M)Tests for aldehyde and ketones
  20. 20The major product in the following reaction is :03 Apr, 2025 (E)Chemical reactions for aldehydes and ketones
  21. 21An optically active alkyl halide \( {C}_4 {H}_9 {Br}\) [A] reacts with hot KOH dissolved in ethanol and forms alkene [B] as major product wh02 Apr, 2025 (M)Method of preparation for both aldehydes and ketones
  22. 22The product \(( {P})\) formed in the following reaction is :29 Jan, 2025 (M)Chemical reactions for aldehydes and ketones
  23. 23Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol C28 Jan, 2025 (M)Chemical reactions for aldehydes and ketones
  24. 24A molecule (" P ") on treatment with acid undergoes rearrangement and gives ("Q"). ("Q") on ozonolysis followed by reflux under alkaline con28 Jan, 2025 (M)Method of preparation for both aldehydes and ketones
  25. 25Aman has been asked to synthesise the molecule (x).He thought of preparing the molecule using an aldol condensation reaction. He found a few24 Jan, 2025 (M)Chemical reactions for aldehydes and ketones
  26. 26Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?24 Jan, 2025 (M)Chemical reactions for aldehydes and ketones
  27. 27Choose the correct answer from the options given below :24 Jan, 2025 (E)Method of preparation for Aldehydes
  28. 28The major product of the following reaction is: ?23 Jan, 2025 (M)Chemical reactions for aldehydes and ketones
  29. 29Given below are two statements : Consider the following reaction23 Jan, 2025 (E)Chemical reactions for aldehydes and ketones
  30. 30Choose the correct answer from the options given below :23 Jan, 2025 (E)Method of preparation for both aldehydes and ketones
  31. 31Residue (dil) Compound Structure of residue (A) and compound (B) formed respectively is :22 Jan, 2025 (E)Method of preparation for Aldehydes
  32. 32Identify major product " \( {X}\) " formed in the following reaction :09 Apr, 2024 (M)Method of preparation for Aldehydes
  33. 33Match List I with List II \( {array}{|l|l|l|l|} & { List - I (Test) } & & {List - II (Observation)} \\ { A. } & {Br}_2 { water test } & { I.09 Apr, 2024 (E)Tests for aldehyde and ketones
  34. 34Which of the following compound can give positive iodoform test when treated with aqueous \( {KOH}\) solution followed by potassium hypoiodi09 Apr, 2024 (E)Tests for aldehyde and ketones
  35. 35Which of the following compounds will give silver mirror with ammoniacal silver nitrate? A. Formic acid B. Formaldehyde C. Benzaldehyde D. A09 Apr, 2024 (E)Tests for aldehyde and ketones
  36. 36Match List - I with List - II. \( {array}{|c|c|c|c|} & { (Test) } & & { (Identification) } \\ { (A) } & { Bayer's test MARKS } & { (I) } & {08 Apr, 2024 (E)Tests for aldehyde and ketones
  37. 37Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous \( {NaOH}\) after heating gives \(x\) as the major08 Apr, 2024 (E)Chemical reactions for aldehydes and ketones
  38. 38Which among the following aldehydes is most reactive towards nucleophilic addition reactions?06 Apr, 2024 (M)Chemical reactions for aldehydes and ketones
  39. 39Identify ' \(A\) ' in the following reaction:05 Apr, 2024 (M)Chemical reactions for aldehydes and ketones
  40. 40In the Claisen-Schmidt reaction to prepare \(351 {~g}\) of dibenzalacetone using \(87 {~g}\) of acetone, the amount of benzaldehyde required05 Apr, 2024 (E)Chemical reactions for aldehydes and ketones
  41. 41Given below are two statements : Statements I : Acidity of \( \)-hydrogens of aldehydes and ketones is responsible for Aldol reaction. State04 Apr, 2024 (M)Chemical reactions for aldehydes and ketones
  42. 42Identify the product in the following reaction :04 Apr, 2024 (M)Chemical reactions for aldehydes and ketones
  43. 43The number of the correct reaction(s) among the following is ______04 Apr, 2024 (M)Method of preparation for Aldehydes
  44. 44Match List – I with List –II. Choose the correct answer from options given below:01 Feb, 2024 (M)Chemical reactions for aldehydes and ketones
  45. 45The product of the following reaction is P . The number of hydroxyl groups present in the product P is________.31 Jan, 2024 (M)Method of preparation for both aldehydes and ketones
  46. 46Identify the name reaction.31 Jan, 2024 (E)Method of preparation for Aldehydes
  47. 47This reduction reaction is known as:30 Jan, 2024 (M)Method of preparation for Aldehydes
  48. 48The compound formed by the reaction of ethanal with semicarbazide contains _______ number of nitrogen atoms.30 Jan, 2024 (M)Chemical reactions for aldehydes and ketones
  49. 49m-chlorobenzaldehyde on treatment with 50 % KOH solution yields30 Jan, 2024 (E)Chemical reactions for aldehydes and ketones
  50. 50From the compounds given below, number of compounds which give positive Fehling's test is Benzaldehyde, Acetaldehyde, Acetone, Acetophenone,29 Jan, 2024 (M)Reactions for aldehydes

Frequently Asked Questions

1.How many questions are available for Aldehydes and Ketones?

This chapter includes 169 questions compiled from JEE Main papers spanning 2002 to 2026.

2.Are these questions only from JEE Main, or from other exams too?

These are JEE Main questions specifically for the Aldehydes and Ketones chapter. Questions from other exams like NTA Abhyas (JEE Main) or JEE Advanced are organised separately under their respective exam sections.

3.Is Aldehydes and Ketones an important chapter for JEE Main Chemistry?

Aldehydes and Ketones has appeared in 20 of the 25 years of JEE Main papers covered here, with 169 questions across 122 papers - about one per paper it appears in.

4.What is the difficulty level of Aldehydes and Ketones questions in JEE Main?

Of the 169 questions analysed for this chapter, 18% are easy, 50% moderate and 31% tough. 2021 had the most, with 25 questions.

5.Which topics in Aldehydes and Ketones should I focus on?

These topics have carried the most weightage in Aldehydes and Ketones:

  • Chemical reactions for aldehydes and ketones - 91 questions (54%)
  • Tests for aldehyde and ketones - 30 questions (18%)
  • Method of preparation for both aldehydes and ketones - 25 questions (15%)
  • Chemical reactions for aldehydes and ketones has produced the most tough questions (34).
6.Is Aldehydes and Ketones's weightage in JEE Main going up or down?

Across all 122 papers analysed, Aldehydes and Ketones has averaged about 1.4 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.9 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.