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Nylon -66 is a copolymer of
A. urea and fomaldehyde
B. hexamethylene diamine and adipic acid
C. phenol and formaldehyde
D. vinyl chloride and vinyl alcohol .

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Correct Answer - B
It is polymer of two monomers ` H_2N(CH_2)_6NH_2 and HOOC(CH_2)_4 COOH` . It is a polyamide , because it has amide linkage i.e (-CONH-) linkages .

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