Question

The final product (D) in the above sequential reaction is: 

• A. 1
• B. 2
• C. 3
• D. 4

Hint:

The reaction sequence involves oxidation, bromination, and elimination to form naphthalene through a coupling reaction.

Answer 1

The Correct Option is A

Step 1: Oxidation with V\(_2\)O\(_5\).
Vanadium pentoxide (V\(_2\)O\(_5\)) and air oxidize the starting compound, initiating the process by forming a benzyl alcohol derivative.

Step 2: Bromination.
Bromination with Br\(_2\) and KOH proceeds to form a brominated intermediate that undergoes dehydrobromination.

Step 3: Final Step.
The final step involves heating with sodium hydroxide (NaOH) to induce a coupling reaction, leading to the formation of naphthalene.

Step 4: Conclusion.
Thus, the final product (D) is naphthalene, which matches option (1).

Final Answer: \[ \boxed{\text{(1) Naphthalene}} \]