Identify the compound which is least reactive towards nucleophilic substitution reactions.

An equimolar mixture of toluene and chlorobenzene is treated with a mixture of conc. $H_{2}SO_{4}$ and conc. $HNO_{3}$. Indicate the correct statement from the following.

Identify the major product formed in the following reaction.
$Chlorobenzene \xrightarrow{Cl_2, \text{ Anhydrous } FeCl_3} \text{Product}$

As compared with chlorocyclohexane, which of the following statements correctly apply to chlorobenzene?
$A$. The magnitude of negative charge is more on chlorine atoms.
$B$. The $C-Cl$ bond has partial double bond character.
$C$. $C-Cl$ bond is less polar.
$D$. $C-Cl$ bond is longer due to repulsion between delocalised electrons of the aromatic ring and lone pairs of electrons of chlorine.
$E$. The $C-Cl$ bond is formed using $sp^2$ hybridised orbital of carbon.
Choose the correct answer from the options given below:

Why do aryl halides undergo electrophilic substitution reactions at $o-$ and $p-$positions? Why are they less reactive than benzene?

The major product $P$ formed in the following reaction is