Which of the following compounds are arranged in the order of decreasing reactivity towards electrophilic aromatic substitution?

When benzene is chlorinated in the presence of $FeCl_3$,the electrophile is .......

Given below are two statements $:$
Statement $(I) :$ On nitration of $m-$xylene with $HNO_3, H_2SO_4$ followed by oxidation,$4-$nitrobenzene$-1, 3-$dicarboxylic acid is obtained as the major product.
Statement $(II) :$ $-CH_3$ group is $o/p-$directing while $-NO_2$ group is $m-$directing group.
In the light of the above statements,choose the correct answer from the options given below $:$

What is the major product $X$ in the following reaction?
$\text{Benzene} + CH_3CH_2CH_2Cl \xrightarrow{AlCl_3} (X)$

Identify the major product of the following reaction:

The electrophilic aromatic substitution proceeds through a