Nylon 6, 6 is a condensation polymer of two monomers X and Y . The number of - CH ₂- groups in X and Y are respectively

Step-by-step solution

Nylon-6,6 is synthesised by polycondensation of hexamethylenediamine and adipic acid. aligned & n HOOC - ( CH ₂ )₄- COOH +n H ₂ ~N - ( CH ₂ )₆- NH ₂ & + CO - ( CH ₂ )₄- CO - NH - ( CH ₂ )₆- NH +_n & +(2 n-1) H ₂ O aligned Number of - CH ₂ -group is 6 in hexamethylene-diamine and 4 in adipic acid.