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Aldehydes, Ketones and Carboxylic Acids

Previous year questions with solutions · 2024 – 2026

83Questions
54Papers covered
5.05%Weightage 2026same as last year
’24
’25
’26
Year-wise statistics questions · papers · average per paper · weightage
YearQuestionsPapersAvg / paperWeightage
202624191.35.05% same as last year
202524191.35.05% ▼ 13.2% vs last year
202435211.75.82%

11 questions · newest paper first

Ques. 1JEE Main 2026, 6 April (Evening Shift)

'x' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at 333 K. 'y' is the product which is obtained by the reaction of ethane nitrile with methyl magnesium bromide in dry ether followed by hydrolysis. IUPAC name of product obtained from 'x' and 'y' in the presence of barium hydroxide followed by heating is :

  1. 2-Methylpent-4-en-3-one
  2. 4-Methylpent-3-en-2-one
  3. 4-Methylpent-1-ene
  4. 2-Methylpent-3-one
Ques. 2JEE Main 2026, 5 April (Morning Shift)

" P " is a hydrocarbon of molecular formula:- C8H14. On ozonolysis, " P " forms "Q". "Q" on treatment with alkali under reflux condition produces "R", which on treatment with I2/NaOH gives a yellow precipitate. Acidification of the solution gives "S". The structure of "S" is given below:- [figure] The correct structure of P is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3JEE Main 2026, 24 January (Evening Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are false
  3. Both Statement I and Statement II are true
  4. Statement I is false but Statement II is true
Ques. 4JEE Main 2026, 23 January (Morning Shift)

'x' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. 'y' is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of 'x' and one mole of 'y' react with each other in the presence of alkali followed by heating?

  1. 2-Methylpent-2-enal
  2. 2-Methylbut-2-enal
  3. 3-Methylbut-2-enal
  4. Pent-2-enal
Ques. 5JEE Main 2025, 8 April (Evening Shift)

When [figure] undergoes intramolecular aldol condensation, the major product formed is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6JEE Main 2025, 4 April (Morning Shift)

Aldol condensation is a popular and classical method to prepare , -unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is not a product of intramolecular aldol condensation?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 7JEE Main 2025, 2 April (Morning Shift)

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is correct but Statement II is incorrect
  2. Both Statement I and Statement II are correct
  3. Both Statement I and Statement II are incorrect
  4. Statement I is incorrect but Statement II is correct
Ques. 8JEE Main 2025, 28 January (Morning Shift)

Both acetaldehyde and acetone (individually) undergo which of the following reactions? Choose the correct answer from the options given below:

  1. C and E Only
  2. A, B and D Only
  3. A, C and E Only
  4. B, C and D Only
Ques. 9JEE Main 2025, 24 January (Morning Shift)

Aman has been asked to synthesise the molecule [figure] He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He thought of performing ozonolysis reaction on alkene to produce a dicarbonyl compound followed by aldol reaction to prepare "x". Predict the suitable alkene that can lead to the formation of "x".

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10JEE Main 2024, 4 April (Morning Shift)

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Both Statement I and Statement II are incorrect
  2. Statement I is correct but Statement II is incorrect
  3. Both Statement I and Statement II are correct
  4. Statement I is incorrect but Statement II is correct
Ques. 11JEE Main 2024, 29 January (Evening Shift)

Identify the reagents used for the following conversion [figure]

  1. A = LiAlH4, B = NaOH(aq), C = NH2-NH2/KOH, ethylene glycol
  2. A = DIBAL-H, B = NaOH(aq), C = NH2-NH2/KOH, ethylene glycol
  3. A = LiAlH4, B = NaOH(alc), C = Zn/HCl
  4. A = DIBAL-H, B = NaOH(alc), C = Zn/HCl