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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
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 | ... 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?
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.