**Assertion (A):** Thermosetting polymers undergo a permanent, irreversible phase change upon their initial heating in a mold. **Reason (R):** Heating thermosetting polymers induces the formation of e

Question

**Assertion (A):** Thermosetting polymers undergo a permanent, irreversible phase change upon their initial heating in a mold. 
**Reason (R):** Heating thermosetting polymers induces the formation of extensive covalent cross-links between the polymer chains, creating a rigid 3D network.

Prashant Kotian · Accepted Answer

Correct answer: A. Thermosetting polymers (like Bakelite) undergo a chemical reaction upon heating that forms massive covalent networks, permanently locking their shape and preventing them from ever melting again.

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