What is the total number of benzene derivatives with the molecular formula $C_6H_3Cl_3$?

On attachment of $H$ and $Br$ from the $HBr$ to $C_6H_5$ free radical,what can be formed?

In benzene,the $1, 3$ position is called:

Give the reaction for $n$-hexane reacting in the presence of a catalyst (aromatization).

Which of the following is a carcinogen?

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.