How many hydroxy groups are present in hydroxyquinol?

Answer the following questions: Which product is obtained when benzene is heated with $CH_3Cl$ in the presence of $AlCl_3$? Why?

Toluene contains:

The major product of the following reaction is:
$Glucose \xrightarrow[(ii) \ Mo_2O_3, \ 773 \ K, \ 10-20 \ atm]{(i) \ HI, \ \Delta} ?$

The reagent used in Friedel-Crafts reaction is:

The compound '$A$' with molecular formula $C_8H_{10}$ (aromatic) which gives $1$ mononitro substituted product and $3$ dinitro substituted products is: