Question

The reaction steps shown are: 

The final product (P) is:

• A. 1
• B. 2
• C. 3
• D. 4

Hint:

The reduction with Na-Hg in ethanol is a key step in forming quinoline, which is an aromatic heterocyclic compound.

Answer 1

The Correct Option is B

 

Step 1: Sodium Ethoxide Reaction. 
Sodium ethoxide (Na-EtOH) induces an elimination reaction where the pyridine undergoes dehydrohalogenation to form a substituted intermediate. 
 

Step 2: Methylation Reaction with CH3\(\text{I}\). 
The methyl iodide (\(CH_3I\)) reacts with the nitrogen of pyridine, introducing a methyl group at the nitrogen atom, creating a quaternary salt. 
 

Step 3: Moist Silver Oxide and Heating. 
Heating the reaction mixture with moist Ag\(_2\)O leads to the formation of an intermediate that is prone to further rearrangement due to aromaticity. 
 

Step 4: Reduction with Sodium Mercury. 
The sodium amalgam (Na-Hg) in ethanol reduces the intermediate, leading to the formation of quinoline, which is the final product (P). 
 

Final Answer: \[ \boxed{\text{Quinoline}} \]