What is the decreasing order of reactivity towards nucleophilic substitution for the following compounds?

Nitrobenzene on reaction with conc. $HNO_3/H_2SO_4$ at $80-100 \ ^oC$ forms which one of the following products?

Which compound is used as an explosive?

Which among the following compounds reacts with $NaOH$ at the fastest rate?

Which of the following reactions is not correctly represented?

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: