DP Chemistry (last assessment 2024)

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Question 20N.3.hl.TZ0.a

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.3.hl.TZ0.a
Level hl Paper 3 Time zone TZ0
Command term Deduce Question number a Adapted from N/A
a.
[Maximum mark: 1]
20N.3.hl.TZ0.a

Aspirin is formed by reacting salicylic acid with ethanoic anhydride. The structure of aspirin is given in section 37 of the data booklet.

Deduce the structural formula of the by-product of this reaction.

[1]

Markscheme

OR

CH3COOH ✔


Accept full OR condensed structural formula.

Examiners report

Most candidates were able to deduce a correct structural formula (either full or condensed) for ethanoic acid. A minority did not read the question fully and gave the structure of aspirin instead of the by-product of the reaction. Another incorrect answer cited as the by-product was water.

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