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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2025 (Online) 28th January Evening ShiftMCQMedium📈 Topic in 14% papers+4−1
Ques. 1JEE Main 2025, 28 January (Evening Shift)

The total number of compounds from below when treated with hot KMnO4, giving benzoic acid is: [figure] , [figure] , [figure] , [figure] , [figure] , [figure] , [figure] , [figure]

  1. 4
  2. 3
  3. 5
  4. 6

Answer

(3) 5

Solution

Hot alkaline/acidic KMnO4 oxidises a side chain on benzene to –COOH, whatever its length, provided the carbon attached to the ring (benzylic carbon) carries at least one H atom.

Toluene (-CH3), ethylbenzene (-CH2CH3), cumene (-CH(CH3)2), isobutylbenzene (-CH2CH(CH3)2) and propylbenzene (-CH2CH2CH3) all have a benzylic H each gives benzoic acid C6H5COOH: 5 compounds.

tert-Butylbenzene (-C(CH3)3) and 2-phenylpropan-2-ol (-C(OH)(CH3)2) have no benzylic H not oxidised to benzoic acid.

4,4′-Dimethylbiphenyl gives biphenyl-4,4′-dicarboxylic acid, not benzoic acid.

Number of compounds = 5

Answer: (3)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2JEE Main 2025, 24 January (Morning Shift)

Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?

  1. acetophenone < benzaldehyde < p-tolualdehyde < p-nitrobenzaldehyde
  2. acetophenone < p-tolualdehyde < benzaldehyde < p-nitrobenzaldehyde
  3. p-nitrobenzaldehyde < benzaldehyde < p-tolualdehyde < acetophenone
  4. benzaldehyde < acetophenone < p-nitrobenzaldehyde < p-tolualdehyde
Ques. 3JEE 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. 4JEE Main 2025, 24 January (Evening Shift)

Match List - I with List - II. Choose the correct answer from the options given below :

  1. (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
  2. (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
  3. (A)-(I), (B)-(III), (C)-(II), (D)-(IV)
  4. (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
Ques. 5JEE Main 2025, 23 January (Morning Shift)

The major product of the following reaction is : [figure]

  1. [figure]
  2. CH3-CH2-CH2-OH
  3. [figure]
  4. [figure]
Ques. 6JEE Main 2025, 23 January (Evening Shift)

Given below are two statements: Consider the following reaction [figure] 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 true
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are false
Ques. 7JEE Main 2025, 22 January (Morning Shift)

The compounds which give positive Fehling's test are : Choose the correct answer from the options given below :

  1. A, C and D Only
  2. A, B and C Only
  3. A, D and E Only
  4. C, D and E Only
Ques. 8JEE Main 2025, 22 January (Evening Shift)

[figure] Residue (A) + HCl (dil) Compound (B) Structure of residue (A) and compound (B) formed respectively is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9JEE Main 2024, 9 April (Morning Shift)

Identify major product "X" formed in the following reaction : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10JEE Main 2024, 9 April (Morning Shift)

[figure] What is the structure of C?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11JEE Main 2024, 9 April (Evening Shift)

Which of the following compounds can give positive iodoform test when treated with aqueous KOH solution followed by potassium hypoiodite.

  1. CH3CH2- O \|C-CH2CH3
  2. [figure]
  3. CH3CH2- Cl | Cl |C-CH3
  4. CH3CH2CH2CHO

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