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Chemistry - Aldehydes and Ketones

Practise 46 KCET previous year questions on Aldehydes and Ketones, compiled from papers spanning 2008 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 KCET tests.

Aldehydes and Ketones has been asked in 18 of the 20 years of KCET papers analysed (2007–2026), with 46 questions in all. 39% of them were easy, 52% moderate and 9% tough. Most of its questions came from 2026, with 5 questions that year. In the last three years (2024–2026) it had 8 questions across 3 papers, about 2.7 per paper.

The chapter's 7 topics are not weighted equally: Chemical reactions for aldehydes and ketones (17 questions, 37%), Tests for aldehyde and ketones (14 questions, 30%), and Method of preparation for both aldehydes and ketones (7 questions, 15%) have been asked the most. Chemical reactions for aldehydes and ketones has also led over the last five years, with 5 questions. Chemical reactions for aldehydes and ketones has produced the most tough questions (3).

  1. 1The organic compounds and are2026Preparation and Properties of Alcohols
  2. 2Match the reagents in List-I with products obtained from their carbonyl compounds in List-II. List-I List-II (a) (i) Cyanohydrin (b) (ii) Ox2026Chemical reactions for aldehydes and ketones
  3. 3The major product ' ' in the given reaction is Benzaldehyde ' ' (Major product)2026Chemical reactions for aldehydes and ketones
  4. 4The compound that does not answer iodoform test is2026Tests for aldehyde and ketones
  5. 5Match List-I with List-II and select the correct options List-I (Functional group) List-II (Functional group reagent) (a) (i) Neutral ferric2026Tests for aldehyde and ketones
  6. 6Statement - I : Reduction of ester by DIABL-H followed by hydrolysis gives aldehyde. Statement - II : Oxidation of benzyl alcohol with aqueo2025Chemical reactions for aldehydes and ketones
  7. 7Arrange the following compounds in their decreasing order of reactivity towards Nucleop addition reaction.2025Chemical reactions for aldehydes and ketones
  8. 8Sodium ethanoate on heating with soda lime gives ' '. Electrolysis of aqueous solution of sodium ethanoate gives ' and ' respectively are2024Reactions for ketones
  9. 9Hybridisation change involved at in the above reaction.2023Method of preparation for both aldehydes and ketones
  10. 10A better reagent to oxidise primary alcohols into aldehyde is2023Method of preparation for both aldehydes and ketones
  11. 11In the reaction, Formation of and are known by2023Method of preparation for Aldehydes
  12. 12Compounds and in the following reaction are2023Chemical reactions for aldehydes and ketones
  13. 13The general name of the compound formed by the reaction between aldehyde and alcohol is2022Reactions for aldehydes
  14. 14Reaction by which benzaldehyde cannot be prepared is2022Method of preparation for Aldehydes
  15. 15The test to differentiate between pentan-2-one and pentan-3-one is2022Tests for aldehyde and ketones
  16. 16An organic compound on treatment with PCC in dichloromethane gives the compound . Compound reacts with and alkali to form yellow precipitate2021Tests for aldehyde and ketones
  17. 17and respectively are2021Method of preparation for Aldehydes
  18. 18and are2021Reactions for aldehydes
  19. 19Which is the most suitable reagent for the following conversion ?2021Chemical reactions for aldehydes and ketones
  20. 20The product ' ' gives white precipitate when treated with bromine water. The product ' ' is treated with barium hydroxide to give the produc2021Chemical reactions for aldehydes and ketones
  21. 21The product ' is2020Chemical reactions for aldehydes and ketones
  22. 22The carbonyl compound that does not undergo aldol condensation is2020Chemical reactions for aldehydes and ketones
  23. 23The reagents \( A, B \) and \( C \) respectively are2019Chemical reactions for aldehydes and ketones
  24. 24The appropriate reagent for the following transformation is2018Chemical reactions for aldehydes and ketones
  25. 25Which of the following is the correct electron dot structure of \( {N}_{2} {O} \) molecule ?2017Method of preparation for both aldehydes and ketones
  26. 26The reaction quotient ' \( Q_{C}{ }^{ } \) is useful in predicting the direction of the reaction. Which of the following is incorrect?2017Chemical reactions for aldehydes and ketones
  27. 27Toluene reacts with halogen in presence of iron (III) chloride giving ortho and para halo compounds. The reaction is2017Chemical reactions for aldehydes and ketones
  28. 28Benzene carbaldehyde is reacted with concentrated \( {NaOH} \) solution to give the products \( {A} \) and B. The product \( A \) can be use2016Chemical reactions for aldehydes and ketones
  29. 29An organic compound \( {X} \) is oxidised by using acidified \( {K}_{2} {Cr}_{2} {O}_{7} \) solution. The product obtained reacts with pheny2016Tests for aldehyde and ketones
  30. 30The distinguishing test between methanoic acid and ethanoic acid is2015Tests for aldehyde and ketones
  31. 31The formation of cyanohydrin from a ketone is an example of2015Chemical reactions for aldehydes and ketones
  32. 32lodoform can be prepared from all, except2015Tests for aldehyde and ketones
  33. 33The IUPAC name of the complex ion formed when gold dissolves in aquaregia is2014Method of preparation for both aldehydes and ketones
  34. 34The compound that reacts the fastest with sodium methoxide is2014Tests for aldehyde and ketones
  35. 35The correct arrangement for the ions in the increasing order of their radii is2014Reactions for ketones
  36. 36\( 1.78 {~g} \) of an optically active \( L \)-amino acid \( ( {A}) \) is treated with \( {N} a {~N} {O}_{2} / {H} {Cl} \) at \( 0^{ } {C} .2014Tests for aldehyde and ketones
  37. 37The reagent used to distinguish between acetaldehyde and benzaldehyde is2013Tests for aldehyde and ketones
  38. 38The reagent with which both acetaldehyde and acetone react is2011Tests for aldehyde and ketones
  39. 39One mole of an organic compound A with the formula reacts completely with two moles of HI to form and . When is boiled with aqueous alkali i2010Tests for aldehyde and ketones
  40. 40Benzaldehyde and acetone can be best distinguished using2010Tests for aldehyde and ketones
  41. 41Which one of the following statements is true?2010Method of preparation for both aldehydes and ketones
  42. 42The correct sequence of steps involved in the mechanism of Cannizaro's reaction is2010Chemical reactions for aldehydes and ketones
  43. 43In the above reaction is2009Chemical reactions for aldehydes and ketones
  44. 44The compound which is not formed during the dry distillation of a mixture of calcium formate and calcium acetate is2009Method of preparation for both aldehydes and ketones
  45. 45The compound which forms acetaldehyde when heated with dilute , is2009Method of preparation for both aldehydes and ketones
  46. 46Which of the following organic compounds answers to both iodoform test and Fehling's test?2008Tests for aldehyde and ketones

Frequently Asked Questions

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

This chapter includes 46 questions compiled from KCET papers spanning 2008 to 2026.

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

These are KCET 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 KCET Chemistry?

Aldehydes and Ketones has appeared in 18 of the 20 years of KCET papers covered here, with 46 questions across 18 papers - about 3 per paper it appears in.

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

Of the 46 questions analysed for this chapter, 39% are easy, 52% moderate and 9% tough. 2026 had the most, with 5 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 - 17 questions (37%)
  • Tests for aldehyde and ketones - 14 questions (30%)
  • Method of preparation for both aldehydes and ketones - 7 questions (15%)
  • Chemical reactions for aldehydes and ketones has produced the most tough questions (3).
6.Is Aldehydes and Ketones's weightage in KCET going up or down?

Across all 18 papers analysed, Aldehydes and Ketones has averaged about 2.6 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 2.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.