The action of $AlCl_3$ in Friedel-Crafts reaction is

Consider the reaction sequence below:
Anisole $\xrightarrow[AlCl_3]{\text{Succinic anhydride}} A$ $\xrightarrow[\text{Clemmensen's reduction}]{\text{Cyclization}} X$
Identify $X$.

For preparing monoalkyl benzene,the acylation process is preferred over direct alkylation because:

The correct order of reactivity in electrophilic substitution reaction of the following compounds is:

The ease of nitration of the following three hydrocarbons follows the order: $(I)$ Toluene,$(II)$ $m$-Xylene,$(III)$ $p$-Xylene.

Thiophene and benzene are separated by