Benzene was discovered by

Hexane $\xrightarrow[\substack{773 \ K \\ 10-20 \ atm}]{Cr_2O_3} X$ $\xrightarrow[\text{Anhydrous } AlCl_3]{CH_3COCl} Y$. $Y$ in the above sequence of reactions is

When benzene is heated with acetic anhydride in the presence of anhydrous aluminium chloride at $80 \ ^\circ C,$ the product formed is :

What is the major product of the following reaction?
$1,4-dichlorocyclohexa-1,4-diene \xrightarrow{Na, \text{dry ether}} ?$

The most common type of reaction in aromatic compounds is

The major product formed in the following reaction sequence is:
$C_6H_5-CHBr-CH_2Br$ $\xrightarrow[(ii) NaNH_2]{(i) alc. KOH}$ $\xrightarrow[(iii) \text{Red hot iron tube}, 873 K]{}$