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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2024 (Online) 5th April Morning ShiftMCQEasy📈 Topic in 2% papers+4−1
Ques. 1JEE Main 2024, 5 April (Morning Shift)

For the Compounds : (A) H3C-CH2-O-CH2-CH2-CH3 (B) H3C-CH2-CH2-CH2-CH3 (C) CH3-CH2- O \|C-CH2-CH3 (D) H3C- OH |CH-CH2-CH2-CH3 The increasing order of boiling point is : Choose the correct answer from the options given below :

  1. (D) < (C) < (A) < (B)
  2. (B) < (A) < (C) < (D)
  3. (A) < (B) < (C) < (D)
  4. (B) < (A) < (D) < (C)

Answer

(2) (B) < (A) < (C) < (D)

Solution

Similar molar masses (72–88) ⇒ b.p. decided by the intermolecular forces:

(B) pentane: only weak London forces ⇒ lowest (309 K)

(A) ether: weak dipole–dipole (C–O–C) ⇒ (A) > (B) (337 K)

(C) ketone: strong dipole–dipole (polar C=O) ⇒ (C) > (A) (375 K)

(D) alcohol: intermolecular H-bonding ⇒ highest (392 K)

∴ (B) < (A) < (C) < (D)

Answer: (2)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

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

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

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

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

Ques. 6JEE 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. 7JEE 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. 8JEE Main 2024, 4 April (Morning Shift)

Identify the product in the following reaction: [figure]

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

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

Ques. 10JEE 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. 11JEE 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]

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