DP Chemistry (last assessment 2024)

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Question 22N.2.sl.TZ0.4b

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.sl.TZ0.4b
Level sl Paper 2 Time zone TZ0
Command term Describe Question number b Adapted from N/A
b.
[Maximum mark: 1]
22N.2.sl.TZ0.4b

An organic compound, A, reacts with ethanoic acid to produce B using concentrated sulfuric acid as a catalyst.

(b)

Compound A can also react with bromine. Describe the change observed if A is reacted with bromine.

[1]

Markscheme

brown/orange/red/yellow to colourless ✔


Do not accept clear for colourless.

Examiners report

Although it was a straightforward organic question, 22% of the candidates left it blank, indicating less confidence in answering the organic chemistry questions. 40% of the candidates gained the mark for the decolourization of bromine. One of the common mistakes was reversing the colour change and another was using the term "clear" instead of "colourless".

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