Aldehydes Ketones and Carboxylic Acids NEET PYQs (1995–2026)

Solved Aldehydes Ketones and Carboxylic Acids PYQs

3 recent questions with answers. The full set of 106 is free to practise.

1. NEET 2026HardAcidity and Basicity
   Q1

   Given below are two statements:
   
   Statement I: Oxidation of p-nitrotoluene with acidic KMnO₄ gives an acid that is stronger than benzoic acid.
   
   Statement II: Reduction of p-nitrotoluene with Sn/HCl followed by neutralization gives an amine that is more basic than aniline.
   
   In light of the above statements, choose the most appropriate answer from the options given below:

   • ABoth Statement I and Statement II are correct
   • BBoth Statement I and Statement II are incorrect
   • CStatement I is correct but Statement II is incorrect
   • DStatement I is incorrect but Statement II is correct

   Show answer & solution

   Correct answer: (A)

   p-Nitrotoluene oxidation gives p-nitrobenzoic acid, which is stronger than benzoic acid (due to -NO₂ group). Reduction of p-nitrotoluene with Sn/HCl gives p-toluidine (p-methylaniline), which is more basic than aniline (due to +I effect of CH₃). So both statements correct.
2. NEET 2026MediumDistinguishing Tests
   Q2

   In a test tube containing a salt, a few drops of dilute H₂SO₄ was added, which gave colourless vapours having the smell of vinegar. The vapours turned the blue litmus paper red. Identify the correct anion from the following:

   • ASulphide, S²^-
   • BSulphate, SO₄²^-
   • CAcetate, CH₃COO^-
   • DCarbonate, CO₃²^-

   Show answer & solution

   Correct answer: (C)

   Acetate salt with dilute H₂SO₄ gives acetic acid (vinegar smell), which turns blue litmus red.
3. NEET 2022ModerateReduction Reactions
   Q3

   Which of the following reactions is not an example for nucleophilic addition - elimination reaction ? [NEET Re-2022]

   • A${CH}_{3}CHO+{NH}_3\rightleftharpoons {CH}_{3}CH=NH+H_{2}O$
   • B${CH}_{3}CHO+{NaHSO}_3\rightleftharpoons {CH}_3-\stackrel{OH}{\underset{H}{I}}-{OSO}_{2}Na$
   • C${CH}_{3}CHO+{NH}_{2}OH\rightleftharpoons {CH}_{3}CH=N-OH+H_{2}O$
   • D${CH}_{3}CHO+C_6{H}_5{NHNH}_2\rightleftharpoons {CH}_{3}CH=N-{NHC}_6{H}_5+H_{2}O$

   Show answer & solution

   Correct answer: (B)

   In nucleophilic addition-elimination reactions along with the product water molecule is eliminated. But in reaction of ${CH}_{3}CHO$ and ${NaHSO}_3$ only addition takes place.

Topic-wise question count

Where NEET has asked from Aldehydes Ketones and Carboxylic Acids, most frequent first.

• Reactions of Aldehydes and Ketones15
• Preparation of Aldehydes and Ketones14
• Acidity and Basicity11
• Distinguishing Tests10
• Named Reactions10
• Cannizzaro Reaction9
• Reduction Reactions9
• Oxidation Reactions9
• Iodoform Test9
• Claisen Condensation9
• Named reactions1

Year-wise Aldehydes Ketones and Carboxylic Acids questions in NEET

Number of questions from this chapter in each year's paper(s).