Which of the following is IUPAC name of hydroquinone?

Calculate the number of atoms in 0.3 gram metal if it forms bec structure $\left[\rho \times \mathrm{a}^3=3 \times 10^{-22} \mathrm{~g}\right]$

Identify the product ' $Z$ ' in the following series of reactions.

Ethanol $\xrightarrow[\Delta]{\mathrm{SOCl}_2} \mathrm{X} \xrightarrow[\text { Dryether }]{\mathrm{Mg}} \mathrm{Y} \xrightarrow{\mathrm{NH}_3} \mathrm{Z}$

Which of the following formula is used to calculate compressibility factor?