Aldehydes, Ketones and Carboxylic Acids: JEE Main Previous Year Questions (2021-2026)

 Page 1


JEE Main Previous Year Questions (2021-2026): 
Aldehydes, Ketones and Carboxylic Acids  
 
(January 2026) 
 
Q1: The correct order of acidic strength of the major products formed in the given 
reactions, is: 
 
Choose the correct answer from the options given below: 
A: C > A > D > B 
B: A > D > C > B 
C: A > D > B > C 
D: C > B > A > D 
Answer: A 
Explanation: 
Correct order of acidic strength of major product formed in the given reaction is 
Page 2


JEE Main Previous Year Questions (2021-2026): 
Aldehydes, Ketones and Carboxylic Acids  
 
(January 2026) 
 
Q1: The correct order of acidic strength of the major products formed in the given 
reactions, is: 
 
Choose the correct answer from the options given below: 
A: C > A > D > B 
B: A > D > C > B 
C: A > D > B > C 
D: C > B > A > D 
Answer: A 
Explanation: 
Correct order of acidic strength of major product formed in the given reaction is 
 
 
C > A > D > B 
 
Q2: Which of the following reaction is NOT correctly represented? 
A:  
B:  
C:  
D:  
Page 3


JEE Main Previous Year Questions (2021-2026): 
Aldehydes, Ketones and Carboxylic Acids  
 
(January 2026) 
 
Q1: The correct order of acidic strength of the major products formed in the given 
reactions, is: 
 
Choose the correct answer from the options given below: 
A: C > A > D > B 
B: A > D > C > B 
C: A > D > B > C 
D: C > B > A > D 
Answer: A 
Explanation: 
Correct order of acidic strength of major product formed in the given reaction is 
 
 
C > A > D > B 
 
Q2: Which of the following reaction is NOT correctly represented? 
A:  
B:  
C:  
D:  
Answer: A 
Explanation:  
 
 
Major product of reaction (1) will be 
 
Page 4


JEE Main Previous Year Questions (2021-2026): 
Aldehydes, Ketones and Carboxylic Acids  
 
(January 2026) 
 
Q1: The correct order of acidic strength of the major products formed in the given 
reactions, is: 
 
Choose the correct answer from the options given below: 
A: C > A > D > B 
B: A > D > C > B 
C: A > D > B > C 
D: C > B > A > D 
Answer: A 
Explanation: 
Correct order of acidic strength of major product formed in the given reaction is 
 
 
C > A > D > B 
 
Q2: Which of the following reaction is NOT correctly represented? 
A:  
B:  
C:  
D:  
Answer: A 
Explanation:  
 
 
Major product of reaction (1) will be 
 
As 3° radical more stable 
 
Q3: Given below are two statements for the following reaction sequence. 
 
Statement I : Compound ‘Z’ will give yellow precipitate with NaOI . 
Statement II : Compound Q has two different types of H atoms (aromatic : 
aliphatic) in the ratio 1 : 3. 
In the light of the above statements, choose the correct answer from the options 
given below : 
A: Statement I is true but Statement II is false 
B: Both Statement I and Statement II are true 
C: Statement I is false but Statement II is true 
D: Both Statement I and Statement II are false 
Answer: B 
Explanation: 
 
 
Page 5


JEE Main Previous Year Questions (2021-2026): 
Aldehydes, Ketones and Carboxylic Acids  
 
(January 2026) 
 
Q1: The correct order of acidic strength of the major products formed in the given 
reactions, is: 
 
Choose the correct answer from the options given below: 
A: C > A > D > B 
B: A > D > C > B 
C: A > D > B > C 
D: C > B > A > D 
Answer: A 
Explanation: 
Correct order of acidic strength of major product formed in the given reaction is 
 
 
C > A > D > B 
 
Q2: Which of the following reaction is NOT correctly represented? 
A:  
B:  
C:  
D:  
Answer: A 
Explanation:  
 
 
Major product of reaction (1) will be 
 
As 3° radical more stable 
 
Q3: Given below are two statements for the following reaction sequence. 
 
Statement I : Compound ‘Z’ will give yellow precipitate with NaOI . 
Statement II : Compound Q has two different types of H atoms (aromatic : 
aliphatic) in the ratio 1 : 3. 
In the light of the above statements, choose the correct answer from the options 
given below : 
A: Statement I is true but Statement II is false 
B: Both Statement I and Statement II are true 
C: Statement I is false but Statement II is true 
D: Both Statement I and Statement II are false 
Answer: B 
Explanation: 
 
 
Q4: Given below are the four isomeric compounds (P, Q, R, S) 
 
Identify correct statements from below. 
A. Q, R and S will give precipitate with 2, 4-DNP. 
B. P and Q will give positive Bayer's test. 
C. Q and R will give sooty flame. 
D. R and S will give yellow precipitate with I 2/NaOH. 
E. Q alone will deposit silver with Tollen's reagent 
Choose the correct option. 
A: C and E only 
B: A and E only 
C: A, B, D and E only 
D: A, C and E only 
Answer: D 
Explanation: 
(A) Q, R and S give the 2, 4-DNP test because each of them contains a carbonyl group 
(> C = O) of aldehyde/ketone. In this test, aldehydes and ketones form an orange/yellow 
precipitate of the 2, 4-dinitrophenylhydrazone. 
(C) Q and R give a sooty flame because they contain an aromatic ring. Aromatic 
compounds have a higher carbon content, so they burn with incomplete combustion and 
produce a smoky (sooty) flame. 
(E) Only Q gives Tollens’ test because Q is an aldehyde. Aldehydes reduce Tollens’ 
reagent (ammoniacal silver nitrate) to metallic silver, so a silver deposit/mirror is 
obtained. Ketones (R and S) do not give this test. 
 
Q5: The unsaturated ether on acidic hydrolysis produces carbonyl compounds as 
shown below: 
 
Based on this, predict the solution/reagent that will help to distinguish "P" and 
"Q" obtained in the following reaction:-