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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2025 (Online) 23rd January Morning ShiftMCQMedium📈 Topic in 11% papers+4−1
Ques. 1JEE Main 2025, 23 January (Morning Shift)

The major product of the following reaction is : [figure]

  1. [figure]
  2. CH3-CH2-CH2-OH
  3. [figure]
  4. [figure]

Answer

(3) [figure]

Solution

Concept: HCHO has no α-H: it adds to the α-C of the other aldehyde, then reduces it (crossed Cannizzaro).

Step 1: propanal has two α-H ⇒ adds two HCHO (aldol):

[figure]

Step 2: no α-H left ⇒ excess HCHO reduces –CHO to –CH2OH:

[figure]

∴ CH3C(CH2OH)3

Answer: (3)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2JEE Main 2025, 23 January (Evening Shift)

Given below are two statements: Consider the following reaction [figure] In the light of the above statements, choose the correct answer from the options given below :

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are false
Ques. 3JEE Main 2025, 22 January (Morning Shift)

The compounds which give positive Fehling's test are : Choose the correct answer from the options given below :

  1. A, C and D Only
  2. A, B and C Only
  3. A, D and E Only
  4. C, D and E Only
Ques. 4JEE Main 2025, 22 January (Evening Shift)

[figure] Residue (A) + HCl (dil) Compound (B) Structure of residue (A) and compound (B) formed respectively is :

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

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