DP Chemistry (last assessment 2024)

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Question 19M.3.hl.TZ1.9c

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.hl.TZ1.9c
Level hl Paper 3 Time zone TZ1
Command term Draw Question number c Adapted from N/A
c.
[Maximum mark: 1]
19M.3.hl.TZ1.9c

Aspartame is a derivative of a dipeptide formed between two amino acids, phenylalanine (Phe) and aspartic acid (Asp).

(c)

Aspartic acid is obtained synthetically as a racemic mixture. Draw the three‑dimensional shape of each isomer showing their spatial relationship to each other. Use section 33 of the data booklet.

[1]

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Examiners report

Was very poorly answered. Many candidates had difficulty drawing a 3D structure and showing the spatial relationship of two enantiomers. An incorrect amino acid residue was often used, or incorrect bond connections drawn.

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