$C_6H_6 + 3Cl_2 \xrightarrow{UV \ \text{light}} \text{Product}$. In the above reaction,the product is:

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

Identify the heteroatom and the number of double bonds present in furan,respectively.

Two aromatic compounds $P$ and $Q$ give product $R.$ Reactant $P, Q$ and reagent used in the above reaction are

Arrange the following compounds in their correct order of reactivity towards electrophilic substitution reaction:

The electrophile involved in the sulphonation of benzene is