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Chemistry Question on classification of polymers

The monomers used for their preparation of nylon-22-nylon-66 is/are

A

caprolactam

B

alanine and amino caproic acid

C

glycine and amino caproic acid

D

hexamethylenediamine and adipic acid

Answer

glycine and amino caproic acid

Explanation

Solution

Nylon-2-nylon-6 is an alternating polyamide copolymer of glycine (containing two carbon atoms) and e-amino-caproic acid (containing six carbon atoms).
nH2N−CH2−COOHGlycine +nH2N−(CH2)5−COOH∈−aminocaproic acid \underset{Glycine}{\mathop{n{{H}_{2}}N-C{{H}_{2}}-COOH}}\,+\underset{\in -aminocaproic\text{ }acid}{\mathop{n{{H}_{2}}N-{{(C{{H}_{2}})}_{5}}-COOH}}\, [−NH−CH2−C∣∣ O −NH−(CH2)5−C∣∣ O −nylon−2−nylon−6 ]n{{\left[ \underset{nylon-2-nylon-6}{\mathop{-NH-C{{H}_{2}}-\underset{\begin{smallmatrix} |\,\,| \\\ O \end{smallmatrix}}{\mathop{C}}\,-NH-{{(C{{H}_{2}})}_{5}}-\underset{\begin{smallmatrix} |\,\,| \\\ O \end{smallmatrix}}{\mathop{C}}\,-}}\, \right]}_{n}} +(2n−1)H2O+(2n-1){{H}_{2}}O