Which of the following represents $H$ückel's rule for aromaticity?

In the sulphonation,acetylation and formylation of benzene,the group of effective electrophiles would be:

Identify the major product from the following reaction sequence.

Provide basic information about aromatic hydrocarbons. Explain and give examples of the following: $(i)$ Aromatic compounds $(ii)$ Arenes $(iii)$ Benzenoid compounds $(iv)$ Non-benzenoid compounds.

The major product formed in the following reaction sequence is:
$C_6H_5-CHBr-CH_2Br$ $\xrightarrow[(ii) NaNH_2]{(i) alc. KOH}$ $\xrightarrow[(iii) \text{Red hot iron tube}, 873 K]{}$

Describe various oxidation reactions of benzene.