Which of the following groups is strongly ortho and para directing?

$p-$Dichlorobenzene has a higher $m.p.$ than those of $o-$ and $m-$ isomers. Discuss.

The rate of reaction of $NaOH$ with the following compounds follows the order:
$I$: $1$-fluoro-$2$-nitrobenzene
$II$: $1$-fluoro-$3$-nitrobenzene
$III$: $1$-fluoro-$4$-nitrobenzene

$C_7H_8$ $\xrightarrow{3Cl_2 / \text{heat}} A$ $\xrightarrow{Fe/Br_2} B$ $\xrightarrow{Zn/HCl} C$. What is compound $C$?

The compound used as an explosive is

Product $A$ of the given reaction is