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Aldehydes, Ketones and Carboxylic Acids · Question 24

JEE Main 2026 (Online) 21st January Evening ShiftMatchingEasy📈 Topic in 3% papers+4−1
1

Match List - I with List - II. Choose the correct answer from the options given below :

  1. A-II, B-III, C-IV, D-I
  2. A-IV, B-III, C-I, D-II
  3. A-IV, B-I, C-II, D-III
  4. A-II, B-IV, C-I, D-III

Answer

(4) A-II, B-IV, C-I, D-III

Solution

A. Acyl chloride is reduced to aldehyde by H2 over Pd poisoned with BaSO4: Rosenmund reduction (II).

R-COCl H2, Pd-BaSO4 R-CHO

B. Nitrile is reduced by SnCl2/HCl to the imine, which on hydrolysis gives aldehyde: Stephen reaction (IV).

R-CN [H3O+]SnCl2 + HCl R-CHO

C. Chromyl chloride in CS2 oxidises the methyl group of toluene to –CHO via a chromium complex: Etard reaction (I).

D. Benzene with CO and HCl in presence of anhydrous AlCl3 (or CuCl) gives benzaldehyde: Gattermann–Koch reaction (III).

A-II, B-IV, C-I, D-III

Answer: (4)

JEE Main 2026 (Online) 21st January Evening Shift

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

A [(ii) H3O+](i) NaOH B [(ii) H2SO4, ](i) EtOH C 'A' shows positive Lassaigne's test for N and its molar mass is 121. 'B' gives effervescence with aq NaHCO3. 'C' gives fruity smell. Identify A, B and C from the following.

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 8th April Evening Shift
3

When [figure] undergoes intramolecular aldol condensation, the major product formed is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 8th April Evening Shift
4

Which of the following compounds is least likely to give effervescence of CO2 in presence of aq. NaHCO3?

  1. Ph- NH3 Cl
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 7th April Morning Shift
5

"P" is an optically active compound with molecular formula C6H12O. When "P" is treated with 2,4-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tollens' reagent, "P" gives a negative test. Predict the structure of "P".

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 7th April Evening Shift
6

Aldol condensation is a popular and classical method to prepare , -unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is not a product of intramolecular aldol condensation?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 4th April Morning Shift
7

Which among the following compounds give yellow solid when reacted with NaOI/NaOH? Choose the correct answer from the options given below :

  1. (A) and (C) Only
  2. (C) and (D) Only
  3. (B), (C) and (E) Only
  4. (A), (C) and (D) Only
JEE Main 2025 (Online) 4th April Evening Shift
8

Number of molecules from below which cannot give iodoform reaction is : Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Butanal, 2-Pentanone, 3-Pentanone, Pentanal and 3-Pentanol.

  1. 4
  2. 3
  3. 5
  4. 2
JEE Main 2025 (Online) 3rd April Morning Shift
9

The major product (P) in the following reaction is : Ph- O \|C- O \|C-H [ ]KOH Major ProductP

  1. Ph- O \|C-COO K
  2. Ph- OH |CH-CH2OH
  3. Ph- OH |CH-COO K
  4. Ph- O \|C-CH2OH
JEE Main 2025 (Online) 3rd April Evening Shift
10

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is correct but Statement II is incorrect
  2. Both Statement I and Statement II are correct
  3. Both Statement I and Statement II are incorrect
  4. Statement I is incorrect but Statement II is correct
JEE Main 2025 (Online) 2nd April Morning Shift
11

Consider the following molecules: [figure] The correct order of rate of hydrolysis is :

  1. p > q > r > s
  2. r > q > p > s
  3. p > r > q > s
  4. q > p > r > s
JEE Main 2025 (Online) 2nd April Morning Shift

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