On the basis of molecular forces, which pair represents thermosetting polymers only?

Thermosetting polymers: These polymers are cross-linked or heavily branched molecules which, on heating, undergo extensive cross linking in moulds and again become infusible. These cannot be reused. Some common examples are bakelite, urea-formaldelyde resins (UFR), etc. Melamine resin is an example of thermosetting polymers and used in the making of worktop surfaces. Duroplast is a thermosetting polymer that is light in weight. It is used for making car parts.  Hence, melamine resin and duroplast are the examples of thermosetting polymers.