Photo AI
Which statement about HOCH₂CH(NH₂)COOH is correct? A - AQA - A-Level Chemistry - Question 33 - 2022 - Paper 3
Question 33
Which statement about HOCH₂CH(NH₂)COOH is correct? A. It decolourises bromine water. B. It is a component of DNA. C. It is insoluble in water. D. It reacts with ... show full transcript
Worked Solution & Example Answer:Which statement about HOCH₂CH(NH₂)COOH is correct? A - AQA - A-Level Chemistry - Question 33 - 2022 - Paper 3
Step 1
D. It reacts with hydrochloric acid.
Answer
The correct statement is that HOCH₂CH(NH₂)COOH reacts with hydrochloric acid. This compound is an amino acid known as aspartic acid, which contains both a carboxylic acid group (-COOH) and an amine group (-NH₂). When reacted with hydrochloric acid, the amine group can get protonated to form a positively charged ammonium ion. This highlights the acidic and basic properties of amino acids due to the presence of both carboxyl and amino groups, making option D the accurate choice.