Which of the following is/are produced when a mixture of benzene vapour and oxygen is passed over $V_2O_5$ catalyst at $775\, K$?

Considering the reaction shown below,identify the major product:

Which of the following groups increases the reactivity of electrophilic aromatic substitution?

Identify the number of aromatic compounds from the following structures:
$(I)$ Cyclopentadiene
$(II)$ Cyclooctatetraene
$(III)$ Borazine $(B_3N_3H_6)$
$(IV)$ $1,4-$diboracyclohexa$-2,5-$diene

Which one of the following methods is suitable to generate aromatic compound$(s)$ from linear aliphatic saturated hydrocarbons with at least six carbon atoms?

The product obtained by the complete nitration of toluene is ......... .