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Aldehydes, Ketones and Carboxylic Acids · Question 35

JEE Main 2025 (Online) 2nd April Evening ShiftMCQMedium📈 Topic in 19% papers+4−1
1

Consider the following reactions. From these reactions which reaction will give carboxylic acid as a major product? Choose the correct answer from the options given below:

  1. A, B and E only
  2. A and D only
  3. B, C and E only
  4. B and E only

Answer

(4) B and E only

Solution

(A) Partial (mild) hydrolysis of a nitrile stops at the amide: R-C N H+/H2O R-CONH2. Not an acid.

(B) Grignard reagent adds to CO2; hydrolysis gives the acid: R-MgX CO2 R-COOMgX H3O+ R-COOH. Acid.

(C) Stephen reduction: SnCl2/HCl gives the imine salt, hydrolysis gives the aldehyde R-CHO. Not an acid.

(D) PCC oxidises a 1° alcohol only up to the aldehyde R-CHO. Not an acid.

(E) Rosenmund reduction (H2, Pd–BaSO4) gives benzaldehyde; bromine water then oxidises the aldehyde to benzoic acid:

C6H5COCl H2, Pd-BaSO4 C6H5CHO Br2 water C6H5COOH. Acid.

B and E only.

Answer: (4)

JEE Main 2025 (Online) 2nd April Evening Shift

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

The product (P) formed in the following reaction is : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 29th January Morning Shift
3

[figure] 0.1 mole of compound 'S' will weigh g. (Given molar mass in g mol-1 C : 12, H : 1, O : 16)

JEE Main 2025 (Online) 29th January Morning Shift
4

Both acetaldehyde and acetone (individually) undergo which of the following reactions? Choose the correct answer from the options given below:

  1. C and E Only
  2. A, B and D Only
  3. A, C and E Only
  4. B, C and D Only
JEE Main 2025 (Online) 28th January Morning Shift
5

The compounds that produce CO2 with aqueous NaHCO3 solution are: Choose the correct answer from the options given below:

  1. A and C Only
  2. A, B and E Only
  3. A and B Only
  4. A, C and D Only
JEE Main 2025 (Online) 28th January Morning Shift
6

The total number of compounds from below when treated with hot KMnO4, giving benzoic acid is: [figure] , [figure] , [figure] , [figure] , [figure] , [figure] , [figure] , [figure]

  1. 4
  2. 3
  3. 5
  4. 6
JEE Main 2025 (Online) 28th January Evening Shift

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