The function of anhydrous $AlCl_3$ in the Friedel-Crafts reaction is to

How many $\pi$-bonds are present in a naphthalene molecule?

In electrophilic aromatic substitution reactions of chlorobenzene,the $ortho/para$-directing ability of chlorine is due to its

Which of the following is true about the following groups when attached to a benzene ring?

Benzene reacts with $CH_3Cl$ in the presence of anhydrous $AlCl_3$ to form

Identify the correct statements for a ring system to exhibit aromaticity.
$(i)$ It must not be planar.
$(ii)$ It must possess $(4n+2) \pi$-electrons.
$(iii)$ It must be planar.
$(iv)$ It must possess $4n \pi$-electrons.
The correct answer is