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Aldehydes, Ketones and Carboxylic Acids · Question 25

JEE Main 2025 (Online) 8th April Evening ShiftMCQMedium📈 Topic in 19% papers+4−1
1

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]

Answer

(3) [figure]

Solution

'B' gives effervescence (CO2) with aq. NaHCO3 B is a carboxylic acid.

'C' (fruity smell) is an ester, formed from B by esterification with EtOH / conc. H2SO4.

'A' contains N, has molar mass 121 and gives the acid on hydrolysis with NaOH followed by H3O+ A is an amide.

Benzamide, C6H5CONH2: 7(12) + 7(1) + 14 + 16 = 121 ✓

C6H5CONH2 [(ii) H3O+](i) NaOH C6H5COOH [(ii) H2SO4, ](i) EtOH C6H5COOC2H5

(benzamide → benzoic acid → ethyl benzoate)

Other options: in (1) aminobenzaldehyde has no α-H (no aldol) and its products contain no –COOH; in (2) C6H5CH2NHNH2 has molar mass 122; in (4) NaOH does not convert –CHO into –COOH, and EtOH does not convert –NH2 into –NHEt.

Answer: (3)

JEE Main 2025 (Online) 8th April Evening Shift

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

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
3

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
4

"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
5

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
6

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
7

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
8

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
9

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
10

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
11

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
JEE Main 2025 (Online) 2nd April Evening Shift

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