Chlorobenzene to biphenyl
To convert chlorobenzene to biphenyl, the Wurtz-Fittig reaction is employed.
In this reaction, two molecules of chlorobenzene undergo a coupling reaction in the presence of metallic sodium and dry ether. The sodium facilitates the removal of chlorine atoms and formation of a new carbon-carbon bond between the phenyl groups, resulting in the formation of biphenyl.
\( 2 \ , \text{C}_6\text{H}_5\text{Cl} \xrightarrow{\text{Na , ether}} \text{C}_6\text{H}_5\text{-C}_6\text{H}_5} \)
Product: Biphenyl
Identify A in the following reaction. 
For the reaction, \(N_{2}O_{4} \rightleftharpoons 2NO_{2}\) graph is plotted as shown below. Identify correct statements.
A. Standard free energy change for the reaction is 5.40 kJ \(mol^{-1}\).
B. As \(\Delta G\) in graph is positive, \(N_{2}O_{4}\) will not dissociate into \(NO_{2}\) at all.
C. Reverse reaction will go to completion.
D. When 1 mole of \(N_{2}O_{4}\) changes into equilibrium mixture, value of \(\Delta G = -0.84 \text{ kJ mol}^{-1}\).
E. When 2 mole of \(NO_{2}\) changes into equilibrium mixture, \(\Delta G\) for equilibrium mixture is \(-6.24 \text{ kJ mol}^{-1}\).
Choose the correct answer from the following.

