DP Chemistry (last assessment 2024)

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Question 22N.2.sl.TZ0.2c

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

Chloroquine is a medication used to prevent and treat malaria.

(c)

Compare, giving a reason, the length of the carbon-nitrogen bond in the ring to the length of the carbon-N1 bond.

[1]

Markscheme

«bond in ring is» shorter AND more electrons are shared

OR

«bond in ring is» shorter AND partial double/multiple bonding/bond order 1.5 ✔

Examiners report

30% of the candidates deduced that the C−N bond in the ring is shorter than the single C−N1 bond and were able to give a valid reason in terms of bond multiplicity or resonance.

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