$C_6H_5-CH_3$ $\xrightarrow{KMnO_4} A$ $\xrightarrow[\Delta]{NaOH + CaO} B$, product $B$ is

Identify the position where $E.A.S.$ (Electrophilic Aromatic Substitution) can take place in the given molecule.

The species responsible for nitration and sulphonation by nitric acid/conc. $H_2SO_4$ and fuming $H_2SO_4$ are :

The product obtained in the reaction of benzene with chlorine in the presence of ultraviolet light is ...... .

Catalytic dehydrogenation of $n-heptane$ in the presence of $Cr_2O_3/Al_2O_3$ at $750 \ K$ gives:

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