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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2024 (Online) 4th April Evening ShiftMCQMedium📈 Topic in 10% papers+4−1
Ques. 1JEE 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

Answer

(4) O3, Zn/H2O and NaOH(alc)/I2

Solution

[figure]

"A": the ring C=C is cleaved to two C=O groups (ring opens to a keto-aldehyde) ⇒ reductive ozonolysis, O3, Zn/H2O

"B": CH3CO- becomes -COO Na (one C less) ⇒ haloform reaction, NaOH/I2 (+ CHI3)

∵ H2O, H+ only hydrates the C=C (gives an alcohol, no ring cleavage) and KMnO4 cannot remove the CH3 carbon, options (1), (2), (3) fail.

Answer: (4)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2JEE 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. 3JEE 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. 4JEE 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. 5JEE 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. 6JEE 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. 7JEE 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. 8JEE 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
Ques. 9JEE Main 2024, 30 January (Morning Shift)

In the given reactions, identify the reagent A and reagent B. [figure]

  1. A - CrO3 B - CrO3
  2. A - CrO3 B - CrO2Cl2
  3. A - CrO2Cl2 B - CrO3
  4. A - CrO2Cl2 B - CrO2Cl2
Ques. 10JEE Main 2024, 30 January (Morning Shift)

The compound formed by the reaction of ethanal with semicarbazide contains number of nitrogen atoms.

Ques. 11JEE Main 2024, 30 January (Evening Shift)

m-chlorobenzaldehyde on treatment with 50% KOH solution yields :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

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