The number of hydrogen atoms in the given compound is:

Which of the following statements are correct with respect to benzene?
$(i)$ It forms triozonide with $O_3$.
$(ii)$ It is non-planar.
$(iii)$ It forms only one monosubstituted product with $CH_3COCl$ in the presence of anhydrous $AlCl_3$.
$(iv)$ It forms hexachlorobenzene on heating with $Cl_2$ under photochemical conditions.

How many isomers are formed when a disubstituted benzene is produced from a monosubstituted benzene?

The product of the following reaction is:

The following reaction is given:
$\xrightarrow{\text{Electrolysis}} A$
$A$ is

The decreasing order of the rate of electrophilic aromatic substitution is: