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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2024 (Online) 9th April Evening ShiftMCQMedium📈 Topic in 17% papers+4−1
Ques. 1JEE Main 2024, 9 April (Evening Shift)

Major product of the following reaction is [figure]

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

Answer

(2) [figure]

Solution

Excess CH3MgBr attacks both groups.

Nitrile: one CH3MgBr adds to C≡N giving an imine salt, which H3O+ hydrolyses to a methyl ketone:

Ar-C N CH3MgBr Ar- NMgBr \|C-CH3 H3O+ Ar- O \|C-CH3

Ester: the ketone first formed reacts with a second CH3MgBr, so the ester ends up as a 3° alcohol:

Ar-CO2CH3 2 CH3MgBr Ar-C(CH3)2-OMgBr

H3O+ Ar-C(CH3)2-OH

[figure]

Hence the product carries –COCH3 and –C(CH3)2OH in para positions.

Answer: (2)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2JEE Main 2024, 8 April (Morning Shift)

Identify the product (P) in the following reaction: [figure]

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

Major product B of the following reaction has -bond. [figure]

Ques. 4JEE Main 2024, 8 April (Evening Shift)

The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is: CH3CH2COOH, CH3COOH, CH3CH2CH2COOH, HCOOH

  1. HCOOH > CH3CH2CH2COOH > CH3CH2COOH > CH3COOH
  2. HCOOH > CH3COOH > CH3CH2COOH > CH3CH2CH2COOH
  3. CH3CH2CH2COOH > CH3CH2COOH > CH3COOH > HCOOH
  4. CH3COOH > CH3CH2COOH > CH3CH2CH2COOH > HCOOH
Ques. 5JEE Main 2024, 8 April (Evening Shift)

Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous NaOH after heating gives x as the major product. The number of bonds in the product x is .

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

Which among the following aldehydes is most reactive towards nucleophilic addition reactions?

  1. C2H5- O \|C-H
  2. H- O \|C-H
  3. C3H7- O \|C-H
  4. CH3- O \|C-H
Ques. 7JEE Main 2024, 6 April (Evening Shift)

Consider the given reaction, identify the major product P. CH3-COOH [(iv) H2O/ OH, ](i) LiAlH4 (ii) PCC (iii) HCN/ OH “P”

  1. CH3- OH |CH-COOH
  2. CH3-CH2- O \|C-NH2
  3. CH3- O \|C-CH2CH3
  4. CH3-CH2-CH2-OH
Ques. 8JEE 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)
Ques. 9JEE Main 2024, 5 April (Morning Shift)

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10JEE 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. 11JEE 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

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