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?

Which among the following is a pair of monocarboxylic acids?

What is the half life of a first order reaction if time required to decrease concentration of reactant from 0.8 M to 0.2 M is 12 hour?