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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2024 (Online) 9th April Evening ShiftMCQMedium📈 Topic in 10% papers+4−1
Ques. 1JEE Main 2024, 9 April (Evening Shift)

Which of the following compounds can give positive iodoform test when treated with aqueous KOH solution followed by potassium hypoiodite.

  1. CH3CH2- O \|C-CH2CH3
  2. [figure]
  3. CH3CH2- Cl | Cl |C-CH3
  4. CH3CH2CH2CHO

Answer

(3) CH3CH2- Cl | Cl |C-CH3

Solution

Iodoform test needs a CH3CO- (or CH3CH(OH)-) group in the compound formed after treatment with aq. KOH.

(3): a gem-dichloride is hydrolysed by aq. KOH to a ketone:

CH3CH2- Cl | Cl |C-CH3 aq. KOH CH3CH2- O \|C-CH3

KOI CH3CH2COOK + yellowCHI3

So (3) gives the test.

(1): pentan-3-one has no CH3CO- group, so (1) does not.

(2): the epoxide opens to CH3CH2CH(OH)CH2OH, which has no CH3CH(OH)- group, so (2) does not.

(4): butanal has no CH3CO- group, so (4) does not.

Answer: (3)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2JEE Main 2024, 9 April (Evening Shift)

Which of the following compounds will give silver mirror with ammoniacal silver nitrate? Choose the correct answer from the options given below :

  1. B and C only
  2. C and D only
  3. A, B and C only
  4. A only
Ques. 3JEE Main 2024, 9 April (Evening Shift)

Major product of the following reaction is [figure]

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

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5JEE Main 2024, 8 April (Morning Shift)

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

Ques. 6JEE 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. 7JEE 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. 8JEE 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. 9JEE 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. 10JEE 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. 11JEE Main 2024, 5 April (Morning Shift)

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

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

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