Assertion :Teflon has high thermal stability and chemical inertness.
Reason :Teflon is a thermoplastic.
Due to the presence of strong C–F bonds teflon has high thermal stability and chemical inertness.
And it is true that it is a thermoplastic. It changes shape on heating and retains the shape. It cannot be reshaped on further heating.
So, it is true that it is chemically inert but not because it is a thermoplastic.