DP Chemistry (last assessment 2024)

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Question 22N.2.sl.TZ0.e.i

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

Chloroquine is a medication used to prevent and treat malaria.

Chloroquine can be synthesized by reacting 4,7-dichloroquinoline with another reactant, B.

            4,7-dichloroquinoline                                                            chloroquine

Deduce the structure of B.

[2]

Markscheme

primary amine/–NH2 ✔

rest of structure ✔

 

Do not penalize using “N1”.

Examiners report

Teachers commented that the question included an organic reaction that was beyond the syllabus. They also commented that it would have been better to provide a balanced equation with HCl as the byproduct to help the candidates deduce the reactant B, which is a fair point. Most candidates achieved one mark for the general structure but lost the mark allocated for the NH2 functional group.

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