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Chemistry - Aldehydes and Ketones

Practise 55 COMEDK previous year questions on Aldehydes and Ketones, compiled from papers spanning 2012 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 COMEDK tests.

Aldehydes and Ketones has been asked in 15 of the 15 years of COMEDK papers analysed (2012–2026), with 55 questions in all. 18% of them were easy, 73% moderate and 9% tough. Most of its questions came from 2025, with 12 questions that year. In the last three years (2024–2026) it had 28 questions across 10 papers, about 2.8 per paper.

The chapter's 7 topics are not weighted equally: Chemical reactions for aldehydes and ketones (33 questions, 60%), Method of preparation for both aldehydes and ketones (7 questions, 13%), and Method of preparation for Aldehydes (6 questions, 11%) have been asked the most. Chemical reactions for aldehydes and ketones has also led over the last five years, with 24 questions. Reactions for ketones has produced the most tough questions (2).

  1. 1Which of the following is NOT TRUE about nucleophilic addition reactions of aldehydes?09 May, 2026 (S1)Chemical reactions for aldehydes and ketones
  2. 2Propanal on reaction with dilute NaOH, undergoes aldol condensation resulting in the formation of a compound A. Identify the correct structu09 May, 2026 (S1)Chemical reactions for aldehydes and ketones
  3. 3Etard reaction is a method of preparation of benzaldehyde by oxidation of toluene. The oxidizing agent used in this reaction is:09 May, 2026 (S1)Method of preparation for both aldehydes and ketones
  4. 4Which one of the following is the correct statement?09 May, 2026 (S2)Chemical reactions for aldehydes and ketones
  5. 5Match the reactions in List I with the final products formed as given in List II. List I List II W P X Q Y R Z S09 May, 2026 (S2)Method of preparation for Aldehydes
  6. 6Identify products [P ] and [P ] formed when Benzonitrile undergoes the following reactions.09 May, 2026 (S2)Method of preparation for Aldehydes
  7. 7Which of the following compounds will not give Iodoform reaction?25 May, 2025 (Shift)Tests for aldehyde and ketones
  8. 8In which one of the case the chemical reaction given in Column I does not match with the name of the reaction given in Column II?25 May, 2025 (Shift)Chemical reactions for aldehydes and ketones
  9. 9Aldol condensation reaction between which of the following pair of compounds followed by dehydration gives 3-phenylprop-2-en-1-al?25 May, 2025 (Shift)Chemical reactions for aldehydes and ketones
  10. 10Arrange the following compounds in the increasing order of their reactivity in nucleophilic addition reactions. p-nitrobenzaldehyde (I); met25 May, 2025 (Shift)Chemical reactions for aldehydes and ketones
  11. 11Identify [ X ], the final product formed when 2 moles of Ethanal undergoes the following series of reactions with reagents [(i) to (iv)]10 May, 2025 (S1)Chemical reactions for aldehydes and ketones
  12. 12An organic compound reacts with to give compound which reduces Tollen's reagent and undergoes Cannizzaro's reaction. On rigorous oxidation o10 May, 2025 (S1)Method of preparation for Aldehydes
  13. 13Two statements, one Assertion (A) and the other Reason (R) are given. Choose the correct option. Assertion: Compound reacts with Hydrazine i10 May, 2025 (S1)Chemical reactions for aldehydes and ketones
  14. 14Which one of the following reactions does not give the correct combination of reactants and the major products formed in the reaction?10 May, 2025 (S1)Chemical reactions for aldehydes and ketones
  15. 15An organic compound "A" reacts with Conc. HCl to form p-Xylene. It reduces Tollen's reagent and on oxidation with it yields 1, 4-benzenedica10 May, 2025 (S2)Chemical reactions for aldehydes and ketones
  16. 16Choose the incorrect statement.10 May, 2025 (S2)Chemical reactions for aldehydes and ketones
  17. 17Identify the Carbonyl compound which will not be formed when hydration of Alkynes is carried out with dil. at 333 K . Acetone, Butanal, Etha10 May, 2025 (S3)Method of preparation for both aldehydes and ketones
  18. 18Identify and Z formed in the reaction:10 May, 2025 (S3)Chemical reactions for aldehydes and ketones
  19. 19Which of the following compounds undergo Aldol condensation followed by dehydration to give 3-phenylprop-2-en-1-al?2024 (Afternoon Shift)Chemical reactions for aldehydes and ketones
  20. 20Identify the final product formed when Toluene undergoes a series of reactions with reagents given in the order: (i) / Sunlight (ii) (iii) A2024 (Evening Shift)Reactions of Carbonyl Compounds
  21. 21What is/are the product/s formed when Benzaldehyde and Ethanal react in presence of dil. followed by heating the intermediate product formed2024 (Evening Shift)Chemical reactions for aldehydes and ketones
  22. 22Given are the names of 4 compounds. Two of these compounds will not undergo Cannizzaro's reaction. Identify the two. A. 2-Chlorobutanal B. 22024 (Evening Shift)Chemical reactions for aldehydes and ketones
  23. 23The product in the following reaction is2024 (Memory Based)Method of preparation for Aldehydes
  24. 24The compound formed in the reaction is2024 (Memory Based)Method of preparation for Aldehydes
  25. 25Aldol condensation gives methyl vinyl ketone between which two compound given below?2024 (Memory Based)Chemical reactions for aldehydes and ketones
  26. 26Which one of the following statements is incorrect regarding acetal and ketal formation when Propanal and Propanone are separately reacted w2024 (Morning Shift)Chemical reactions for aldehydes and ketones
  27. 27Identify the Reagents I and II to be used in the course of the given reactions.2024 (Morning Shift)Chemical reactions for aldehydes and ketones
  28. 28A Carbonyl compound when reacted with Methyl magnesium bromide followed by hydrolysis gave product . When is heated with at , it gave (2- Me2024 (Morning Shift)Method of preparation for both aldehydes and ketones
  29. 29Which one of the following compounds would not undergo Aldol condensation?2023 (Evening Shift)Chemical reactions for aldehydes and ketones
  30. 30Identify the final product formed during the course of the given reactions. Pentan-2-one2023 (Evening Shift)Chemical reactions for aldehydes and ketones
  31. 31What would be the products obtained when a mixture of p-Methoxy benzaldehyde and Methanal are heated with concentrated Caustic soda solution2023 (Evening Shift)Chemical reactions for aldehydes and ketones
  32. 32Acetophenone when reacted with a base, , yields a stable compound which has the structure2023 (Memory Based)Chemical reactions for aldehydes and ketones
  33. 33Acetophenone when reacted with a base, , yields a stable compound which has the structure2023 (Morning Shift)Chemical reactions for aldehydes and ketones
  34. 34Preview not available - open to view this question.2022Reactions for ketones
  35. 35Find the product formed for the given reaction.2022Chemical reactions for aldehydes and ketones
  36. 36Find the final product for the reaction2021Chemical reactions for aldehydes and ketones
  37. 37Reaction find the product .2021Reactions for ketones
  38. 38What is the product formed when benzene react with and in presence of anhydrous ?2021Method of preparation for Aldehydes
  39. 39Decomposition of benzene diazonium chloride by using to form chlorobenzene is2020Chemical reactions for aldehydes and ketones
  40. 40The product formed when hydroxylamine condenses with a carbonyl compound is called2020Chemical reactions for aldehydes and ketones
  41. 41The reagent used in Clemmenson's reduction is2020Chemical reactions for aldehydes and ketones
  42. 42Schiffs reagent contains2019Tests for aldehyde and ketones
  43. 43When benzaldehyde is condensed with acetic anhydride in presence of fused sodium acetate, we get2019Reactions for aldehydes
  44. 44When a mixture of calcium benzoate and calcium formate is dry distilled, we get2019Method of preparation for both aldehydes and ketones
  45. 45- When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting compound is2018Method of preparation for both aldehydes and ketones
  46. 46Catalytic dehydrogenation of a primary alcohol gives a/an2017Method of preparation for both aldehydes and ketones
  47. 47The compound on dehydrogenation gives a ketone. The original compound is2017Method of preparation for both aldehydes and ketones
  48. 48Which of the following organic compounds answers to both iodoform test and Fehling's test?2017Tests for aldehyde and ketones
  49. 49Benzoin is2016Chemical reactions for aldehydes and ketones
  50. 50Ethanol, when warmed with iodine and sodium carbonate gives a yellow coloured crystalline solid, which is used in preparation of antiseptic 2015Tests for aldehyde and ketones

Frequently Asked Questions

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

This chapter includes 55 questions compiled from COMEDK papers spanning 2012 to 2026.

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

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

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

Aldehydes and Ketones has appeared in 15 of the 15 years of COMEDK papers covered here, with 55 questions across 24 papers - about 2 per paper it appears in.

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

Of the 55 questions analysed for this chapter, 18% are easy, 73% moderate and 9% tough. 2025 had the most, with 12 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 - 33 questions (60%)
  • Method of preparation for both aldehydes and ketones - 7 questions (13%)
  • Method of preparation for Aldehydes - 6 questions (11%)
  • Reactions for ketones has produced the most tough questions (2).
6.Is Aldehydes and Ketones's weightage in COMEDK going up or down?

Across all 24 papers analysed, Aldehydes and Ketones has averaged about 2.3 questions per paper. In the last three years (2024–2026), that average has risen, at about 2.8 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.