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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2024 (Online) 8th April Morning ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2024, 8 April (Morning Shift)

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

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

Answer

(4) [figure]

Solution

HVZ reaction: an acid with α-H, Br2/red P and then H2O gives the α-bromo acid.

[figure]

Red P and Br2 give PBr3, which turns –COOH into –COBr; its enol takes Br at the α-carbon.

[figure]

(1): –COBr is only the intermediate and H2O hydrolyses it, so (1) is wrong

(2): –COOH is not reduced to –CHO, so (2) is wrong

(3): Br enters the α-carbon (the one carrying –COOH), not the β-carbon, so (3) is wrong

(4): α-bromo acid, so (4) is (P)

Answer: (4)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

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

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

Ques. 3JEE 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. 4JEE 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. 5JEE 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. 6JEE 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. 7JEE 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. 8JEE Main 2024, 5 April (Morning Shift)

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9JEE 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. 10JEE 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. 11JEE Main 2024, 5 April (Evening Shift)

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

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