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Which one of the following is an example of a thermosetting polymer?

1. (CH2 - C = CH - CH2)n Cl
2. (CH2 - CH)n Cl
3. H2N-(CH2)6-NH-C-(CH2)4-C)n
4. OH-CH2-CH(OH)-CH2)n

Correct answer: H2N-(CH2)6-NH-C-(CH2)4-C)n

Solution

Option C represents a thermosetting polymer, as it forms a cross-linked structure upon heating, making it rigid and infusible. The other options represent thermoplastic polymers.

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