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

Decide the correct order of reactivity of the following compounds towards electrophilic aromatic substitution (halogenation) with $(Cl_2 + AlCl_3)$:
$I$: Phenyl benzoate $(C_6H_5COOC_6H_5)$
$II$: Toluene $(C_6H_5CH_3)$
$III$: Ethylbenzene $(C_6H_5CH_2CH_3)$
$IV$: Benzene $(C_6H_6)$

The order of decreasing reactivity towards an electrophilic reagent,for the following would be:
$a$. Benzene
$b$. Toluene
$c$. Chlorobenzene
$d$. Phenol

The carbon-carbon bond length in benzene is

Describe the addition reactions of benzene with chemical equations.

Heating benzene in a large excess of $80\% \, D_2SO_4$ in $D_2O$ results in what product?