DP Chemistry (last assessment 2024)

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

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

(e.i)

Deduce the structure of B.

[2]

Markscheme

primary amine/–NH2 ✔

rest of structure ✔

 

Do not penalize using “N1”.

Examiners report

Students gained about two-thirds of the two marks. Many candidates did not realise the need for an atom to combine with the chlorine and hence terminated their molecule in "–NH". The majority were able to transpose the rest of the structure correctly but some, who unnecessarily chose to convert the skeletal formula into a structural one (about half), made simple errors.

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