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

In the above reaction,' $X$ ' is:

Give the reaction for the acylation of benzene and its mechanism.

The reaction of benzene with $CO$ and $HCl$ in the presence of anhydrous $AlCl_3$ gives :

Match the following reactions in List-$I$ with their corresponding products in List-$II$:
List-$I$ (Reaction):
$A$. $\text{Benzene} + Cl_2 \xrightarrow{AlCl_3}$
$B$. $\text{Benzene} + CH_3Cl \xrightarrow{\text{anhyd. } AlCl_3}$
$C$. $\text{Benzene} + R-CO-Cl \xrightarrow{\text{anhyd. } AlCl_3}$
$D$. $\text{Toluene} \xrightarrow{(i) KMnO_4/KOH, (ii) H_3O^+}$
List-$II$ (Product):
$I$. $\text{Benzoic acid}$
$II$. $\text{Alkyl phenyl ketone}$
$III$. $\text{Chlorobenzene}$
$IV$. $\text{Toluene}$

Identify the polynuclear aromatic compounds that are aromatic from the given structures:
$(i)$ Naphthalene
(ii) Anthracene
(iii) Phenanthrene