Arenes on treatment with chlorine in the presence of ferric chloride $(FeCl_3)$ as a catalyst undergo what type of reaction?

Meta-directing groups among the following are: $(a) -CN$,$(b) -COR$,$(c) -NHCOR$,$(d) -SO_3H$,$(e) -OCH_3$

The following reaction is given:
$\xrightarrow{\text{Electrolysis}} A$
$A$ is

The molecular formula of $3,4$-benzpyrene is ...... .

Which of the following statements is correct regarding the nitration of aromatic compounds?

The reaction sequence is as follows:
$1,4-dibromocyclohex-2-ene$ $\xrightarrow[{2 \, molar \, equivalent}]{{(CH_3)_2NH}} (A)$ $\xrightarrow{{BaO}} (B)$ $\xrightarrow[{ (2 \, molar \, equivalent) }]{{CH_3I}} (C)$ $\xrightarrow{{Ag_2O \, / \, H_2O}} (D) + 2(CH_3)_3N$
Identify the end product $(D)$ in the given sequence.