In the given reactions: (i) CH _ 3 Br Na , ether X [h u ] Br _ 2 Y Na , ether Z (ii) CH _…

In the given reactions:
(i) \(\mathrm{CH}_{3} \mathrm{Br} \xrightarrow{\mathrm{Na}, \text { ether }} X \xrightarrow[h \mathrm{u}]{\mathrm{Br}_{2}} Y \xrightarrow{\mathrm{Na}, \text { ether }} Z\) (ii) \(\mathrm{CH}_{3} \mathrm{COOH} \xrightarrow{\mathrm{NaOH}} X \xrightarrow[\mathrm{CaO}]{\mathrm{NaOH}} Y \xrightarrow[h \mathrm{O}]{\mathrm{Br}_{2}} Z\)
Identify X, Y and Z.