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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2024 (Online) 30th January Morning ShiftMCQEasy📈 Topic in 17% papers+4−1
Ques. 1JEE Main 2024, 30 January (Morning Shift)

[figure] This reduction reaction is known as:

  1. Wolff-Kishner reduction
  2. Etard reduction
  3. Stephen reduction
  4. Rosenmund reduction

Answer

(4) Rosenmund reduction

Solution

RCOCl + H2 Pd-BaSO4 RCHO + HCl

∵ BaSO4 poisons Pd, so the acid chloride is reduced only up to the aldehyde (–CHO)

(A): Wolff–Kishner: C=O → CH2 (NH2NH2/KOH) ⇒ (A) is wrong

(B): Étard: Ar-CH3 → Ar–CHO (CrO2Cl2) ⇒ (B) is wrong

(C): Stephen: R–CN → R–CHO (SnCl2/HCl, then H3O+) ⇒ (C) is wrong

(D): acid chloride → aldehyde with H2, Pd–BaSO4 = Rosenmund reduction ⇒ (D) is correct

Answer: (4)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2JEE Main 2024, 30 January (Morning Shift)

In the given reactions, identify the reagent A and reagent B. [figure]

  1. A - CrO3 B - CrO3
  2. A - CrO3 B - CrO2Cl2
  3. A - CrO2Cl2 B - CrO3
  4. A - CrO2Cl2 B - CrO2Cl2
Ques. 3JEE Main 2024, 30 January (Morning Shift)

The compound formed by the reaction of ethanal with semicarbazide contains number of nitrogen atoms.

Ques. 4JEE Main 2024, 30 January (Evening Shift)

m-chlorobenzaldehyde on treatment with 50% KOH solution yields :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5JEE Main 2024, 29 January (Morning Shift)

The final product A formed in the following multistep reaction sequence is [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6JEE Main 2024, 29 January (Morning Shift)

From the compounds given below, number of compounds which give positive Fehling's test is . Benzaldehyde, Acetaldehyde, Acetone, Acetophenone, Methanal, 4-nitrobenzaldehyde, cyclohexane carbaldehyde.

Ques. 7JEE Main 2024, 29 January (Evening Shift)

Identify the reagents used for the following conversion [figure]

  1. A = LiAlH4, B = NaOH(aq), C = NH2-NH2/KOH, ethylene glycol
  2. A = DIBAL-H, B = NaOH(aq), C = NH2-NH2/KOH, ethylene glycol
  3. A = LiAlH4, B = NaOH(alc), C = Zn/HCl
  4. A = DIBAL-H, B = NaOH(alc), C = Zn/HCl
Ques. 8JEE Main 2024 (Online)

Match List-I with List-II and choose the correct option.

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

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