The compound obtained by passing $C_2H_2$ through a red-hot tube is ...........

The species responsible for nitration and sulphonation by nitric acid/conc. $H_2SO_4$ and fuming $H_2SO_4$ are :

The major product formed in the reaction is:
$Isopropylbenzene + HNO_3 \xrightarrow{conc. H_2SO_4} ?$

When a mixture of concentrated $HNO_3$ and $H_2SO_4$ reacts with benzene at $353 \, K$,what is the name of this reaction?

Rank the following compounds in decreasing order of reactivity towards Electrophilic Aromatic Substitution $(EAS)$ reaction:
$(a)$ $Toluene$
$(b)$ $Nitrobenzene$
$(c)$ $Benzene$
$(d)$ $Chlorobenzene$

Benzene on nitration gives nitrobenzene in the presence of a mixture of $HNO_3$ and $H_2SO_4$,where: