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Which is the repeating unit of a polyamide? A NH₂ | CH₂ | ------- B CH O | CH O | ------- C O | CH₂ | CH₂ | NH₂ ------- D O | CH₂ | CH O | CH₂ | N H - AQA - A-Level Chemistry - Question 33 - 2021 - Paper 3

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Question 33

Which-is-the-repeating-unit-of-a-polyamide?---A---NH₂--|--CH₂--|----------B---CH---O--|--CH---O--|----------C---O--|--CH₂--|--CH₂--|--NH₂----------D---O--|--CH₂--|--CH---O--|--CH₂--|--N---H--AQA-A-Level Chemistry-Question 33-2021-Paper 3.png

Which is the repeating unit of a polyamide? A NH₂ | CH₂ | ------- B CH O | CH O | ------- C O | CH₂ | CH₂ | NH₂ ------- D O | CH₂ | ... show full transcript

Worked Solution & Example Answer:Which is the repeating unit of a polyamide? A NH₂ | CH₂ | ------- B CH O | CH O | ------- C O | CH₂ | CH₂ | NH₂ ------- D O | CH₂ | CH O | CH₂ | N H - AQA - A-Level Chemistry - Question 33 - 2021 - Paper 3

Step 1

Which is the repeating unit of a polyamide?

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Answer

To determine the repeating unit of a polyamide, we must identify the structure that contains both an amine group (NH₂) and a carboxylic acid group (COOH) or their derivatives in a way that repeats. Among the options:

  • Option A contains an amine group but lacks a carboxylic acid group and does not form a repeat.
  • Option B contains carbonyl groups but lacks the necessary amine structure for a polyamide.
  • Option C shows a structure with an amine group, but it's not suitable for forming a polymer chain.
  • Option D presents a structure with both an amine and carbonyl group arranged in a way that they can link to form a repeating unit.

Thus, Option D is the correct answer as it consists of both the functional groups necessary for forming a polyamide.

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