NEET 2018 Chemistry question

Not in JEE Main or NEET syllabus

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

(1)Examples are bakelite and melamine.
(2)They are formed from bi- and tri-functional monomers.
(3)They contain covalent bonds between various linear polymer chains.
(4)They contain strong covalent bonds in their polymer chains.Correct

Answer: (4)

Solution

Cross-linked (network) polymers such as bakelite and melamine-formaldehyde are formed from bi-functional and tri-functional monomers (e.g. phenol and formaldehyde, melamine and formaldehyde); the linear chains are joined by strong covalent cross-links, which makes them hard, rigid and infusible. So statements (1),

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Question ID VK-092248