Match the reagents in List-I with the corresponding reactions in List-II:

**List-I (Reagent)**
A. $H_2, Pd-Ba

Question

Match the reagents in List-I with the corresponding reactions in List-II:

**List-I (Reagent)**
A. $H_2, Pd-BaSO_4$
B. (i) $CrO_2Cl_2, CS_2$ (ii) $H_2O/H^+$
C. $CO, HCl, 	ext{Anhyd. } AlCl_3/CuCl$
D. $CHCl_3, NaOH$

**List-II (Name of the reaction)**
I. Gattermann-Koch reaction
II. Reimer-Tiemann reaction
III. Etard reaction
IV. Rosenmund reduction

Choose the correct answer from the options given below:

Accepted Answer

Let's match the reagents with their corresponding name reactions:
1. $H_2$ in the presence of $Pd-BaSO_4$ is the catalytic reagent used in the **Rosenmund reduction** to reduce acid chlorides to aldehydes (A → IV).
2. Chromyl chloride ($CrO_2Cl_2$) in $CS_2$ followed by acid hydrolysis ($H_2O/H^+$) is used in the **Etard reaction** to oxidize toluene to benzaldehyde (B → III).
3. Carbon monoxide ($CO$) and $HCl$ gas in the presence of anhydrous $AlCl_3/CuCl$ are used in the **Gattermann-Koch reaction** to form benzaldehyde from benzene (C → I).
4. Chloroform ($CHCl_3$) and aqueous $NaOH$ are the reagents for the **Reimer-Tiemann reaction**, which converts phenol into salicylaldehyde (D → II).

Therefore, the correct matching sequence is A-IV, B-III, C-I, D-II.

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