Among the following,the set which represents aromatic species is:

In the conversion of $A$ to $B$,the electrophile involved is:

Nitration is an example of aromatic electrophilic substitution reaction and its rate depends upon the group already present in the benzene ring. Out of benzene and phenol,which one is more easily nitrated?

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

Which of the following statements are correct?
$I$. In nitrating mixture,nitric acid participates as an acid.
$II$. $\sigma$-complex is the intermediate substance in electrophilic substitution of benzene.
$III$. Benzene on Friedel-Crafts alkylation with $n$-propyl chloride gives isopropyl benzene.

In the following reaction sequence,the major product $Q$ is