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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2024 (Online) 5th April Morning ShiftMCQEasy📈 Topic in 12% papers+4−1
Ques. 1JEE Main 2024, 5 April (Morning Shift)

Identify 'A' in the following reaction : [figure]

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

Answer

(4) [figure]

Solution

Wolff–Kishner reduction: C=O group → CH2 group

[figure]

∵ the hydrazone formed in step (i) loses N2 on heating with KOH in ethylene glycol ⇒ C=O becomes CH2

⇒ 'A' = CH3-CH2-CH2-CH3 (butane)

(A): alcohol forms with NaBH4/LiAlH4, not here ⇒ (A) is wrong

(B), (C): hydrazones are only intermediates ⇒ (B), (C) are wrong

Answer: (4)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2JEE Main 2024, 5 April (Evening Shift)

Identify A and B in the given chemical reaction sequence : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3JEE Main 2024, 5 April (Evening Shift)

[figure] Consider the above reaction sequence and identify the major product P.

  1. Methanoic acid
  2. Methoxymethane
  3. Methane
  4. Methanal
Ques. 4JEE Main 2024, 5 April (Evening Shift)

The product C in the following sequence of reactions has bonds. [figure]

Ques. 5JEE Main 2024, 5 April (Evening Shift)

In the Claisen-Schmidt reaction to prepare 351 g of dibenzalacetone using 87 g of acetone, the amount of benzaldehyde required is g. (Nearest integer)

Ques. 6JEE 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
Ques. 7JEE Main 2024, 4 April (Morning Shift)

Identify the product in the following reaction: [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8JEE Main 2024, 4 April (Morning Shift)

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

Ques. 9JEE 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. 10JEE 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. 11JEE 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)

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