Rank the following compounds in decreasing order of reactivity towards Electrophilic Aromatic Substitution $(EAS)$ reaction:
$(a)$ $Toluene$
$(b)$ $Nitrobenzene$
$(c)$ $Benzene$
$(d)$ $Chlorobenzene$

The electrophile,$E^{+}$,attacks the benzene ring to generate the intermediate $\sigma$-complex. Which $\sigma$-complex is of lowest energy?

What will be the product $(A)$ in the following reaction?
$1,4-\text{dibromocyclohexa-1,4-diene} + 2Na \rightarrow (A)$

Complete the following reactions and identify $A, B, C$ respectively:
$(i)$ $\text{Phenol} + A \xrightarrow{\text{distill}} \text{Benzene}$
(ii) $\text{Benzenesulfonic acid} + B \xrightarrow{150-200^{\circ}C, \text{HCl, high pressure}} \text{Benzene}$
(iii) $\text{Chlorobenzene} \xrightarrow{C, \text{NaOH}} \text{Benzene}$

Enumerate different aromatic electrophilic substitution reactions and provide the reactions that show how the electrophiles $(E^{+})$ are formed.

Which one of the following gives a sooty flame on combustion?