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Question:

The two monomers for the synthesis of Nylon 6,6 are:

HOOC(CH2)4COOH,H2N(CH2)4NH2

HOOC(CH2)6COOH,H2N(CH2)4NH2

HOOC(CH2)6COOH,H2N(CH2)6NH2

HOOC(CH2)4COOH,H2N(CH2)6NH2

Solution:

Nylon 66 is made of two monomers each containing 6 carbon atoms, hexamethylenediamine and adipic acid, which give nylon 66 its name. Hexamethylene diamine ↓H2N−(CH2)6−NH2 + Adipic acid ↓HOOC−(CH2)4−COOH. Hence, option D is correct.