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. Vanadium pentoxide (V\(_2\)O\(_5\)) and air oxidize the starting material, producing a benzyl alcohol derivative.

Step 2: Bromination and Dehydrobromination. Bromination using Br\(_2\) and KOH yields a brominated intermediate, which then undergoes dehydrobromination.

Step 3: Coupling. The final step involves heating with sodium hydroxide (NaOH) to promote a coupling reaction and form naphthalene.

Step 4: Identification. The final product (D) is naphthalene, corresponding to option (1).

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