(a) Zn undergoes displacement reaction and is also used for galvanization. The evidences suggest that metal X is Zinc (Zn).
(b) Copper is more reactive than Zn and displaces it while interacting. Copper is also used in making electric wires. These evidences suggest that metal Y is Copper (Cu)
(c) Copper sulphate (CuSO4) is named as YSO4.
(d) Displacement reaction is taking place. In a displacement reaction, more reactive element displaces a lesser reactive element from its salt solution.
CuSO4 (aq) + Zn (s) → ZnSO4 (aq) + Cu (s)
(e) Brass