Which of the following is/are produced when a mixture of benzene vapour and oxygen is passed over $V_2O_5$ catalyst at $775\, K$?

$A$ methyl group attached to benzene can be oxidized to a carboxyl group by reacting with:

Aromatic hydrocarbons mostly exhibit .......

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

What is produced when benzene is alkylated with $n$-propyl chloride in the presence of anhydrous $AlCl_3$?

The number of hydrogen atoms in the given compound is: