Consider the following reaction:

In the following substitution reaction $:$
Product $P$ formed is $:$

What is the correct order of $o/p$ ratio when $E^{+}$ attacks the following systems?
$(A): Ph-F, (B): Ph-Cl, (C): Ph-Br, (D): Ph-I$

Which of the following has the highest reactivity towards nucleophilic substitution reaction involving the cleavage of the $C-Cl$ bond?

When nitrobenzene is reacted with $Br_2$ in the presence of $FeBr_3$,the major product formed is $m$-bromonitrobenzene. This is because:

$A$ mixture of $1 \, mol$ of benzene and $1 \, mol$ of nitrobenzene is reacted with $1 \, mol$ of acetyl chloride in the presence of $AlCl_3$. The major product$(s)$ is/are