Which one of the following compounds is nonaromatic?

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

Which compound from the following contains an $N$ atom in its ring?

Write the sulphonation reactions of benzene.

The rate-determining step for the preparation of nitrobenzene from benzene is:

In which of the following reactions,$t$-butyl benzene is formed?
$1.$ Benzene $+ t$-butyl chloride $\xrightarrow{AlCl_3}$
$2.$ Benzene $+ (CH_3)_2C=CH_2 \xrightarrow{BF_3/HF}$
$3.$ Benzene $+ t$-butyl alcohol $\xrightarrow{H_2SO_4}$
$4.$ Benzene $+$ butanoyl chloride $\xrightarrow{AlCl_3}$ $\xrightarrow{Zn/Hg, HCl}$