Question

Match the two columns:

Choose the correct answer:

• A. A-iv, B-ii, C-iii, D-i
• B. A-iv, B-iii, C-ii, D-i
• C. A-iv, B-iii, C-ii, D-ii
• D. A-iv, B-ii, C-iii, D-i

Hint:

The key to matching reactions and reagents is recognizing the specific reagents used in each reaction. For example, the Gattermann Koch reaction uses \( \text{CO} + \text{HCl}/\text{AlCl}_3 \) while the Rosenmund reduction requires \( \text{H}_2/\text{Pd-BaSO}_4 \).

Answer 1

The Correct Option is B

Step 1: Match Etard reaction (A).
The Etard reaction involves the oxidation of aldehydes to acids, and it requires \( \text{H}_2 \) in the presence of palladium and barium sulfate (\( \text{Pd-BaSO}_4 \)) as the catalyst. Thus, A matches with (iv).
Step 2: Match Gattermann Koch reaction (B).
The Gattermann Koch reaction involves the formylation of aromatic compounds using carbon monoxide and hydrochloric acid in the presence of anhydrous aluminum chloride (\( \text{AlCl}_3 \)). Thus, B matches with (iii).
Step 3: Match Stephen reaction (C).
The Stephen reaction involves the reduction of aldehydes to alkyl groups using tin chloride and hydrochloric acid. Thus, C matches with (ii).
Step 4: Match Rosenmund reduction (D).
The Rosenmund reduction is the partial catalytic hydrogenation of acyl chlorides to aldehydes using palladium on barium sulfate, which fits D matching with (i). Thus, the correct match is A-iv, B-iii, C-ii, D-i.