The reaction shown below is known as:
$2C_6H_5Cl + 2Na \xrightarrow{\text{dry ether}} C_6H_5-C_6H_5 + 2NaCl$

Which of the following has the highest normal boiling point?

What is formed when chlorobenzene reacts with ammonia in the presence of $Cu_2O$ in xylene at $570 \ K$?

Which of the following reactions yields biphenyl from chlorobenzene?

Which of the following reasons support that aryl halides are less reactive than alkyl halides towards nucleophilic substitution reactions?
$a)$ The formation of more stable arenium ion
$b)$ Partial double bond character of $C-X$ bond
$c)$ Longer $C-X$ bond
$d)$ $sp^2$ carbon bonded to $X$ is more electronegative

Which sequence represents the best synthesis of $4-$isopropylbenzonitrile?