Question

Match List-I with List-II and select the correct answer from the given codes. 

List-I (Reaction)	List-II (Reagent/Catalyst)
A. Cannizzaro reaction	1. SnCl2/HCl
B. Stephen's reaction	2. NaOH
C. Clemmensen reduction	3. Zn/Hg - conc. HCl
D. Rosenmund's method	4. Pd/BaSO4, boiling xylene

 

Codes:

	A	B	C	D

• A. \( A \to 4,\quad B \to 1,\quad C \to 3,\quad D \to 2 \)
• B. \( A \to 2,\quad B \to 1,\quad C \to 3,\quad D \to 4 \)
• C. \( A \to 1,\quad B \to 2,\quad C \to 3,\quad D \to 4 \)
• D. \( A \to 1,\quad B \to 2,\quad C \to 3,\quad D \to 4 \)

Hint:

Common name reactions to remember:
Cannizzaro → NaOH
Stephen's → SnCl\(_2\)/HCl
Clemmensen → Zn(Hg)/HCl
Rosenmund → Pd/BaSO\(_4\)

Answer 1

The Correct Option is B

To solve the given matching question, we need to associate each reaction in List-I with its respective reagent or catalyst from List-II. Here's the step-by-step explanation:

1. Cannizzaro Reaction:
   • This is a reaction known for converting aldehydes to alcohols and carboxylic acids.
   • It typically involves the use of a base, such as sodium hydroxide (NaOH), to facilitate the reaction.
   • Therefore, the correct match is \(A \to 2\).
2. Stephen's Reaction:
   • This reaction involves the partial reduction of nitriles (cyanides) to aldehydes.
   • Stannous chloride (SnCl₂) in the presence of hydrochloric acid (HCl) is used as a catalyst.
   • Thus, the correct match is \(B \to 1\).
3. Clemmensen Reduction:
   • In this process, ketones and aldehydes are reduced to alkanes.
   • The reaction employs zinc amalgam (Zn/Hg) in concentrated hydrochloric acid.
   • This makes the correct association \(C \to 3\).
4. Rosenmund's Method:
   • This method is used to reduce acyl chlorides to aldehydes.
   • Palladium on barium sulfate (Pd/BaSO₄) and boiling xylene are the reagents.
   • The proper correspondence is \(D \to 4\).

Based on the analysis above, the correct option is \( A \to 2,\quad B \to 1,\quad C \to 3,\quad D \to 4 \).

Explanation for Incorrect Options:

• Option 1: Incorrect matching; doesn't pair the correct reagent with reactions based on known chemical process requirements.
• Option 3: Incorrect matching; the pairings don't align with conventional reagents used in these reactions.
• Option 4: Repeats Option 3 and is incorrect for the same reasons.