Which of the following is anthracene?

Which order is correct for the decreasing reactivity toward ring monobromination of the following compounds:
$I. \, C_6H_5CH_3$
$II. \, C_6H_5COOH$
$III. \, C_6H_6$
$IV. \, C_6H_5NO_2$

For the given compounds,what is the decreasing order of the rate of electrophilic aromatic substitution?

When chlorine is passed through warm benzene in the presence of sunlight,the product obtained is:

Suggest the name of a Lewis acid other than anhydrous aluminium chloride which can be used during ethylation of benzene.

How is benzene obtained?