Which of the following compounds is not aromatic?

The compound prepared by a substitution reaction of benzene is

Which of the following are aromatic compounds?

Identify the major product $A$ formed in the following Kolbe's electrolysis reaction:

Identify the compound $(X)$ in the following reaction:
[Image of $1,3$-dinitrobenzene reacting with $HNO_3 + H_2SO_4$ to form $(X)$]
Compound $(X)$ is:

Identify the position where electrophilic aromatic substitution $(EAS)$ is most favourable.