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Aldehydes Ketones and Carboxylic Acids question

2025 · 24 Jan · Shift 2 · Q17
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Aldehydes Ketones and Carboxylic Acids question

2025 · 24 Jan · Shift 2 · Q17

JEE MainChemistryAldehydes Ketones and Carboxylic AcidsMCQ+4 / −1

Match List - I with List - II.

List - I List - II
(A) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 16 English 1 (I) Etard reaction
(B) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 16 English 2 (II) Gatterman-Koch reaction
(C) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 16 English 3 (III) Rosenmund reduction
(D) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 16 English 4 (IV) Stephen reaction

Choose the correct answer from the options given below :

  1. A
    (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
  2. B
    (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
  3. C
    (A)-(I), (B)-(III), (C)-(II), (D)-(IV)
  4. D
    (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
View written solutionFree

Correct answer: B

We need to match the unnamed entries in List-I with the named reactions in List-II. The standard aldehyde preparation reactions are:

  1. Etard reaction
    Oxidation of a side-chain methyl group on an aromatic ring to an aldehyde using chromyl chloride.
    Example: toluene →\to→ benzaldehyde.

  2. Gattermann–Koch reaction
    Formylation of benzene or aromatic ring using CO and HCl in presence of AlCl3/CuCl\text{AlCl}_3/\text{CuCl}AlCl3​/CuCl to give an aldehyde.

  3. Rosenmund reduction
    Reduction of acid chloride to aldehyde using poisoned Pd catalyst.

  4. Stephen reaction
    Reduction of nitrile with SnCl2/HCl\text{SnCl}_2/\text{HCl}SnCl2​/HCl followed by hydrolysis to give aldehyde.

Now compare with the usual reactant/product patterns in List-I:

  • Entry corresponding to nitrile →\to→ aldehyde matches Stephen reaction ⇒(A)→(IV)\Rightarrow (A) \to (IV)⇒(A)→(IV)
  • Entry corresponding to acid chloride →\to→ aldehyde matches Rosenmund reduction ⇒(B)→(III)\Rightarrow (B) \to (III)⇒(B)→(III)
  • Entry corresponding to alkyl benzene side-chain oxidation to aldehyde matches Etard reaction ⇒(C)→(I)\Rightarrow (C) \to (I)⇒(C)→(I)
  • Entry corresponding to aromatic formylation matches Gattermann–Koch reaction ⇒(D)→(II)\Rightarrow (D) \to (II)⇒(D)→(II)

Thus the correct matching is:

(A)−(IV),(B)−(III),(C)−(I),(D)−(II)(A)-(IV),\quad (B)-(III),\quad (C)-(I),\quad (D)-(II)(A)−(IV),(B)−(III),(C)−(I),(D)−(II)

This corresponds to Option B.

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