Which of the following is an example of polythene? (a) \( n(\mathrm...

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Which of the following is an example of polythene?
(a) \( n(\mathrm{CH} \equiv \mathrm{CH}) \)
(b) \( \left(-\mathrm{CH}_{2}-\mathrm{CH}_{2}\right)_{n} \)
(c) \( \quad(\mathrm{C} \equiv \mathrm{C})_{n} \)
(d) \( \left(\mathrm{CH}_{2}=\mathrm{CH}_{2}\right)_{n} \)
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