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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2025 (Online) 24th January Morning ShiftMCQMedium📈 Topic in 32% papers+4−1
Ques. 1JEE 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]

Answer

(4) [figure]

Solution

Reverse the aldol: (x) comes from CH3CO(CH2)4CHO, the ozonolysis product of 1-methylcyclohexene.

[figure]

Answer: (4)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2JEE 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. 3JEE 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. 4JEE 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. 5JEE 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. 6JEE 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]

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