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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2024 (Online) 4th April Morning ShiftMCQEasy📈 Topic in 27% papers+4−1
Ques. 1JEE 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

Answer

(2) Statement I is correct but Statement II is incorrect

Solution

Statement I: base removes the acidic -H ⇒ resonance-stabilised enolate ⇒ it adds to C=O of the second molecule ⇒ true.

Statement II: ethanal has -H (gives enolate); benzaldehyde has no -H but its C=O accepts the enolate ⇒ cross aldol (Claisen–Schmidt) product forms:

[figure]

On heating it loses H2O ⇒ C6H5CH=CHCHO (cinnamaldehyde) ⇒ Statement II is false.

Answer: (2)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2JEE Main 2024, 4 April (Morning Shift)

Identify the product in the following reaction: [figure]

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

The number of the correct reaction(s) among the following is . [figure]

Ques. 4JEE Main 2024, 4 April (Evening Shift)

[figure] In the above chemical reaction sequence "A" and "B" respectively are

  1. H2O, H+ and NaOH(alc)/I2
  2. O3, Zn/H2O and KMnO4
  3. H2O, H+ and KMnO4
  4. O3, Zn/H2O and NaOH(alc)/I2
Ques. 5JEE Main 2024, 1 February (Morning Shift)

Identify A and B in the following sequence of reaction [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6JEE Main 2024, 1 February (Morning Shift)

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

  1. (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
  2. (A)-(IV), (B)-(II), (C)-(III), (D)-(I)
  3. (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
  4. (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
Ques. 7JEE Main 2024, 1 February (Evening Shift)

[figure] Acid D formed in above reaction is :

  1. Malonic acid
  2. Oxalic acid
  3. Succinic acid
  4. Gluconic acid
Ques. 8JEE Main 2024, 31 January (Morning Shift)

The product of the following reaction is P. [figure] The number of hydroxyl groups present in the product P is .

Ques. 9JEE Main 2024, 31 January (Evening Shift)

Identify major product 'P' formed in the following reaction. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10JEE Main 2024, 31 January (Evening Shift)

Identify the name reaction. [figure]

  1. Stephen Reaction
  2. Etard Reaction
  3. Gattermann - Koch Reaction
  4. Rosenmund Reduction
Ques. 11JEE Main 2024, 30 January (Morning Shift)

[figure] This reduction reaction is known as:

  1. Wolff-Kishner reduction
  2. Etard reduction
  3. Stephen reduction
  4. Rosenmund reduction

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