The electrophilic aromatic substitution proceeds through a

Which of the following sets contains only aromatic compounds?

Given below are two statements. One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: $[6]-$Annulene,$[8]-$Annulene and cis$-10-$Annulene are respectively aromatic,non-aromatic and non-aromatic.
Reason $R$: Planarity is one of the requirements of aromatic systems.
In the light of the above statements,choose the most appropriate answer from the options given below.

Among the following,the aromatic compound is:

$A$ compound $X$ formed after heating coke with lime reacts with water to give $Y$,which on passing over red-hot iron at $873 \ K$ produces $Z$. The compound $Z$ is

Explain the mechanism of the first and second steps of the general electrophilic substitution reaction for benzene.