Aromatisation of $n$-heptane by passing over $(Al_2O_3 + Cr_2O_3)$ catalyst at $773 \ K$ gives:

Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$ : Benzene is more stable than hypothetical cyclohexatriene.
Reason $R$ : The delocalized $\pi$ electron cloud is attracted more strongly by nuclei of carbon atoms.
In the light of the above statements,choose the correct answer from the options given below:

The reaction of benzene with isobutylene in the presence of $H_2SO_4$ gives:

Which of the following compounds is most reactive toward electrophilic substitution reaction?

Identify the non-benzenoid aromatic compound from the following:

Write down the conditions for a compound to possess aromaticity.