Benzene hexachloride is prepared from benzene and chlorine in the presence of sunlight by:

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:
$CH_3CH_2CH_2CH_2Br$ $\xrightarrow[\text{dry ether}]{Na} X$ $\xrightarrow[\text{10-20 atm}]{\text{Cr}_2\text{O}_3 / 773 \text{ K}} Y$ $\xrightarrow[\text{anhy. AlCl}_3]{\text{CH}_3\text{COCl}} Z$

Which aromatic compound has two double bonds and a five-membered ring?

In benzene,the $1, 3$ position is called:

How many $\pi$-bonds are present in a naphthalene molecule?

The major product$(s)$ of the following reaction is (are):