A-Level AQA Chemistry Optical Isomerism: Which compound is not a 2-aminoc

Which compound is not a 2-aminocarboxylic acid? A - AQA - A-Level Chemistry - Question 35 - 2022 - Paper 3

Question 35

Which compound is not a 2-aminocarboxylic acid? A. CH₃CH(NH₂)COOH B. CH₃CH(NH₂)CH₂COOH C. CH₃CH₂CH(NH₂)COOH D. (CH₃)₂CH(NH₂)COOH

Worked Solution & Example Answer:Which compound is not a 2-aminocarboxylic acid? A - AQA - A-Level Chemistry - Question 35 - 2022 - Paper 3

Step 1

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Answer

The compounds in question are:

We need to determine which of these compounds is not classified as a 2-aminocarboxylic acid.

Step 2

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Answer

A 2-aminocarboxylic acid contains both an amino group (-NH₂) and a carboxylic acid group (-COOH) at the second carbon.

A. CH₃CH(NH₂)COOH: This has the amino group on the second carbon, making it a 2-aminocarboxylic acid.
B. CH₃CH(NH₂)CH₂COOH: The amino group is on the second carbon as well, so it's also a 2-aminocarboxylic acid.
C. CH₃CH₂CH(NH₂)COOH: The amino group is on the third carbon in this case, thus it's not a 2-aminocarboxylic acid.
D. (CH₃)₂CH(NH₂)COOH: Here too, the amino group is located on the second carbon, qualifying it as a 2-aminocarboxylic acid.

Step 3

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Answer

Based on the analysis, the compound that is not a 2-aminocarboxylic acid is:

C. CH₃CH₂CH(NH₂)COOH.