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Regarding cross-linked or network polymers, which of the following statements is incorrect?

Examples are bakelite and melamine.
They are formed from bi- and tri-functional monomers.
They contain covalent bonds between various linear polymer chains.
They contain strong covalents bonds in their polymer chains.
Explanation:

Cross linked or network polymers are formed from bi-functional and tri-functional monomers and contain strong covalent bonds between various linear polymer chains, e.g. bakelite, melamine etc. Option (4) is not related to cross-linking. So option (4) should be the correct option.
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