The reaction of benzene with a mixture of concentrated $HNO_3$ and concentrated $H_2SO_4$ yields nitrobenzene. In this mixture,$HNO_3$ acts as a/an ......

To convert cyclononatetraene into an aromatic ion,the process needed is

Consider the following sequence of reactions. In $Z$,the number of $sp^3$ carbons is $a$ and $sp^2$ carbons is $b$. The value of $(a+b)$ is:
$CH_3CH_2CH_2CH_2Br$ $\xrightarrow[\text{dry ether}]{Na} X$ $\xrightarrow[\text{10-20 atm}]{\text{Cr}_2\text{O}_3 / 773 \text{ K}} Y$ $\xrightarrow[\text{anhy. AlCl}_3]{\text{CH}_3\text{COCl}} Z$

The molecular formula of $3,4$-benzpyrene is ...... .

Which of the following species is used as a reagent in the Friedel-Crafts alkylation reaction?

Which one of these is not true for benzene?