Benzene is obtained by

The order of decreasing reactivity towards an electrophilic reagent for the following compounds is:
$(i)$ Benzene
$(ii)$ Toluene
$(iii)$ Chlorobenzene
$(iv)$ Phenol

The increasing order of the rate of reaction with $HNO_3 / H_2SO_4$ is:

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

Among the following,the aromatic compounds are:

Which of the following has the lowest knocking property?