Suhani, a class 8 student has listed the important properties and uses of a few plastics in the given table.

W, X, Y, and Z could be respectively

W $\to$Polythene: It is light weight and used for making adhesive tapes and as an insulator for electric wires

$X\to PVC$: For making soles of shoes and sanitary fittings thermo plastic

$Y\to$ Bakelite: For making electrical switches and plugs thermo setting plastic

 $Z\to$Melamine Hard, highly polished: For making floor tiles and kitchenware.