Explanation

(d)
Nylon is not homopolymer as it is a copolymer. The monomers of nylon-66 are adipic acid and hexamethylenediamine. Nylon contain
$\ \ \ \ O\ \$
$\ \ \ \ \parallel$
$- C - NH - \$(amide) linkage,hence they are structurally polyamide. Also nylon is condensation polymer as molecule $nHOOC—\left( {CH}_{2} \right)_{4}\ —COOH\ + n\ .HNH—\left( {CH}_{2} \right)_{6}—{NH}_{2}\overset{\ \ \ \ - {nH}_{2}O}{\rightarrow}$
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