An alcohol $X\left(\mathrm{C}_4 \mathrm{H}_{10} \mathrm{O}\right)$ does not give turbidity with conc. HCl and $\mathrm{ZnCl}_2$ at room temperature. $X$ on reaction with reagent $Y$ gives Z . What are $X, Y$ and $Z$ respectively?

Consider the following reactions, $Y$ and $Z$ respectively are

An alcohol $X\left(\mathrm{C}_4 \mathrm{H}_{10} \mathrm{O}\right)$ reacts with conc. HCl at room temperature to give $Y\left(\mathrm{C}_4 \mathrm{H}_9 \mathrm{Cl}\right)$. Reaction of $X$ with copper at 573 K gave $Z$. What is $Z$ ?

A dibromide $X\left(\mathrm{C}_4 \mathrm{H}_4 \mathrm{Br}_2\right)$ on dehydrohalogenation gave $Y$ which on reduction with $Z$ gave non-polar isomer of $\mathrm{C}_4 \mathrm{H}_3$. What are $X$ and $Z$ respectively?