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Which of the following is not the essential structural requirement of an elastomer?

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Which of the following is not the essential structural requirement of an elastomer?

(a) Long flexible chains

(b) Weak intermolecular forces

(c) Rigidity in structure

(d) Occasional cross-linking

I have been asked this question in an international level competition.

I would like to ask this question from Elastomers topic in chapter Polymers of Engineering Chemistry I

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Correct answer is (c) Rigidity in structure

Explanation: Elastomers are a long flexible chain; they are not rigid in nature.

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