Question

Which of the following \(n\) mole compound is obtained when \(2n\) moles of \(\text{C}_6\text{H}_5\text{Cl}\) treated of with \(2n\) mole sodium atom in dry ether?

• A. Biphenyl
• B. Toluene
• C. Phenol
• D. Benzene

Hint:

Two aryl halides couple with sodium in dry ether to give biphenyl (Fittig reaction).

Answer 1

The Correct Option is A

Step 1: Stoichiometry:
Each biphenyl molecule needs two phenyl groups, supplied by two chlorobenzene molecules, and two sodium atoms remove the two chlorine atoms as NaCl.

Step 2: Ratio:
$2n$ of the halide gives $n$ of the dimer. The question statement exactly follows this ratio.

Step 3: Answer:
Option (A).

Final Answer:
Option (A). \[ \boxed{\text{(A) Biphenyl}} \]