Catalytic oxidation of benzene at $500\,^oC$ in the presence of $V_2O_5$ gives ..........

$A$ substance containing an equal number of primary,secondary and tertiary carbon atoms is:

Given below are two statements:
Statement $I$: Tropolone is an aromatic compound and has $8 \pi$ electrons.
Statement $II$: $\pi$ electrons of $ > C = O $ group in tropolone is involved in aromaticity.
In the light of the above statements,choose the correct answer from the options given below:

Given below are two statements $:$
Statement $(I) :$ On nitration of $m-$xylene with $HNO_3, H_2SO_4$ followed by oxidation,$4-$nitrobenzene$-1, 3-$dicarboxylic acid is obtained as the major product.
Statement $(II) :$ $-CH_3$ group is $o/p-$directing while $-NO_2$ group is $m-$directing group.
In the light of the above statements,choose the correct answer from the options given below $:$

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

Which among the following pairs of the structures will give different products on ozonolysis? (Consider the double bonds in the structures are rigid and not delocalized.)