The common name of isopropyl benzene is

Which of the following species is expected to have maximum enthalpy in an electrophilic aromatic substitution reaction?

Give the names and structures of some cancer-causing hydrocarbons.

Identify the product $X$ obtained in the following reaction:
$CH_{3}-(CH_{2})_{4}-CH_{3} \xrightarrow{Cr_{2}O_{3}, 773 \ K, 10-20 \ atm} X$

Using anhydrous $AlCl_3$ as a catalyst,which one of the following reactions produces ethylbenzene $(PhEt)$?

The aromatic carbocation among the following is