The compound prepared by a substitution reaction of benzene is

Which of the following can not react with Bayer's reagent?

Explain why the following systems are not aromatic?

Total number of aromatic compounds from the following is:

Thiophene and benzene are separated by

If $P$ and $S$ are toluene,identify $Q$ and $R$ respectively in the following reaction sequence:
$P$ $\xrightarrow{KMnO_4/KOH} Q$ $\xrightarrow{\text{soda lime}, \Delta} R$ $\xrightarrow{CH_3Cl, \text{anhydrous } AlCl_3} S$