Conversion of hexane into benzene involves the reaction of:

Which of the following is aromatic?

Friedel-Crafts acylation reaction can be used to obtain the compounds:

Find the products $(C)$ and $(E)$ in the following reaction sequences:
$n$-propyl bromide $\xrightarrow{Na} (A)$ $\xrightarrow[Al_2O_3/773 \ K]{CrO_3} (B)$ $\xrightarrow[500 \ K]{Cl_2/UV} (C)$
$n$-propyl bromide $\xrightarrow{Na} (A)$ $\xrightarrow[Al_2O_3/773 \ K]{CrO_3} (B)$ $\xrightarrow{CH_3Cl/AlCl_3} (D)$ $\xrightarrow{Cl_2/hv} (E)$

Assertion : Tropylium cation is aromatic in nature.
Reason : The only property that determines its aromatic behaviour is its planar structure.

Benzene $ + Cl_{2(excess)} \xrightarrow[\Delta ]{AlCl_3} x$
$x$ is