Question

The major products obtained from the reactions in List-II are the reactants for the named reactions mentioned in List-I. Match each entry in List-I with the appropriate entry in List-II and choose the correct option. 

• A. P → 2; Q → 4; R → 1; S → 3
• B. P → 2; Q → 3; R → 4; S → 1
• C. P → 5; Q → 3; R → 4; S → 2
• D. P → 5; Q → 4; R → 2; S → 1

Hint:

To solve matching questions on named reactions, recall the typical starting material or immediate precursor and trace it back from the product.

Answer 1

The Correct Option is B

(P) Stephen reaction: 
Stephen reaction reduces nitriles (RCN) to aldehydes. The precursor is usually benzonitrile, which is derived from benzoic acid.
\[ \Rightarrow P \rightarrow \boxed{2} \quad \text{(Benzoic acid)} \] (Q) Sandmeyer reaction: 
Used to substitute an amino group on an aromatic ring (from aniline) via diazotization. Requires a nitro compound as a precursor.
\[ \Rightarrow Q \rightarrow \boxed{3} \quad \text{(Nitrobenzene)} \] (R) Hoffmann bromamide degradation reaction: 
Converts amides to amines with one fewer carbon. The amine product is Toluene.
\[ \Rightarrow R \rightarrow \boxed{4} \quad \text{(Toluene)} \] (S) Cannizzaro reaction: 
Occurs with aldehydes having no alpha-H (like benzaldehyde), which can be derived from oxidation of toluene.
\[ \Rightarrow S \rightarrow \boxed{1} \quad \text{(Toluene)} \] 

• P → 2
• Q → 3
• R → 5
• S → 1

Final Answer: \( \boxed{\text{B}} \)