Which of the following statements is correct?

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(A) $1$. Nylon-$6,6$ is formed by the condensation polymerization of hexamethylenediamine and adipic acid,which contains amide linkages. Thus,it is a

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Nylon-$6,6$ is a polyamide

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(A) $1$. Nylon-$6,6$ is formed by the condensation polymerization of hexamethylenediamine and adipic acid,which contains amide linkages. Thus,it is a polyamide. This statement is correct.$2$. Bakelite is a thermosetting polymer formed by the condensation of phenol and formaldehyde,resulting in a highly cross-linked structure. Thus,the statement that it is not cross-linked is incorrect.$3$. The Ziegler-Natta catalyst is a mixture of titanium tetrachloride $(TiCl_4)$ and triethylaluminium $(Al(C_2H_5)_3)$. This statement is also correct.$4$. Nylon-$6$ is a fiber,not an elastomer. This statement is incorrect.Note: In many standard chemistry contexts,both $A$ and $C$ are chemically accurate statements. However,$A$ is the most fundamental classification.

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