(a)
Chloroethene has a melting point of -154 °C
All types of PVC melt at temperatures over 100 °C
Explain why PVC melts at a higher temperature than chloroethene.

What are the options? physical property can be color, smell, opacity, viscosity, density, infra red spectrum, melting and boiling points, attraction and repulson to magnets, etc.

Burned piece of steel wool does not gain mass. so only d could be true.