JEE Main 2025 Jan 24 Shift 2, Chemistry Q17: Preparation of Aromatic Aldehydes & Ketones

JEE Main2025Jan 24, Shift 2Chemistry

Match List-I with List-II

List-I

List-II

(I) Etard reaction

(II) Gatterman–Koch reaction

(III) Rosenmund reduction

(IV) Stephen reaction

Choose the correct answer from the options given below :

Solution

Identify each named reaction:

(A) Reduction of a nitrile to an aldehyde using anhydrous $S n C l_{2} / H C l$ followed by hydrolysis is the Stephen reaction $\Rightarrow$ (IV).
(B) Catalytic hydrogenation of an acyl chloride with $H_{2} / P d$ - $B a S O_{4}$ (poisoned catalyst) to give an aldehyde without over-reduction is the Rosenmund reduction $\Rightarrow$ (III).
(C) Oxidation of a methyl-substituted arene by chromyl chloride ( $C r O_{2} C l_{2}$ ) in $C S_{2}$ , followed by hydrolysis of the chromium complex, is the Etard reaction $\Rightarrow$ (I).
(D) Formylation of benzene with $C O + H C l$ in the presence of anhydrous $A l C l_{3}$ (often with $C u C l$ ) is the Gatterman–Koch reaction $\Rightarrow$ (II).

Match: A-IV, B-III, C-I, D-II.

Correct option: (1)

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