Which of following polymer does not contain

Question

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The linkage shown in the image is an amide linkage ( $- CO - N H -$ ).

Let us analyze the given polymers:
1. PAN (Polyacrylonitrile) is an addition polymer formed by the polymerization of acrylonitrile ( $C H_{2} = C H - CN$ ). Its repeating unit is $- [C H_{2} - C H (CN)]_{n} -$ , which does not contain an amide linkage.
2. Nylon 6 is a polyamide formed from caprolactam, so it contains amide linkages.
3. Nylon 6,6 is a polyamide formed from hexamethylenediamine and adipic acid, so it contains amide linkages.
4. Nylon 2,6 is a polyamide formed from glycine and aminocaproic acid, so it also contains amide linkages.

Therefore, PAN is the only polymer among the given options that does not contain the $- CO - N H -$ linkage.

Answer: PAN

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