Choose the Best Answer · Q5
Q.Which one of the following structures represents nylon 6,6 polymer?
(a) a zig-zag carbon backbone carrying pendant -NH2 and -CH3 groups as side substituents, repeat-unit bracket subscript 66
(b) a zig-zag carbon backbone carrying two pendant -NH2 groups as side substituents, repeat-unit bracket subscript 66
(c) a zig-zag carbon backbone carrying H2N-, Cl-, H3C- and HOOC- groups as side substituents, repeat-unit bracket subscript 6
(d) the repeating unit -[-CO-(CH2)x-CO-NH-(CH2)6-NH-]n- built from alternating carbonyl (C=O) and -NH- amide linkages joined through a six-carbon (hexamethylene) chain
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Start your 14-day free trial to unlock the full solution →Step 1. Nylon-6,6 is a condensation polymer, formed by adipic acid and hexamethylene diamine condensing with loss of water to form amide (-CO-NH-) bonds (15.4.3.4) -- so its repeat unit must show carbonyl groups linked to -NH- groups, not just substituents hanging off a plain carbon chain.
Step 2. Options (a), (b) and (c) each draw a simple zig-zag hydrocarbon backbone decorated with pendant groups (-NH2/-CH3, two -NH2, or H2N-/Cl-/H3C-/HOOC-) -- none of these backbones actually contain a connecting amide linkage between repeat units, so none of them can be a real polyamide. …
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