Identify the product formed from chlorobenzene on heating with conc. $HNO_3$ in the presence of conc. $H_2SO_4$.

Why do electrophilic substitution reactions in haloarenes occur at ortho and para positions,yet are slower than in benzene? Explain.

Nitrobenzene on nitration gives

Why does the presence of a $-NO_2$ group at the $o,p$-positions increase the reactivity of haloarenes towards nucleophilic substitution reactions?

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:

The compound that reacts the fastest with sodium methoxide is