DP Chemistry (last assessment 2024)

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Question 22N.2.hl.TZ0.d

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

Chloroquine is a medication used to prevent and treat malaria.

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

Almost everybody identified the C−N bond in the ring as being shorter, but only about half could justify this using bond order or the resonance/delocalization that produces it. A significant number incorrectly thought the one in the ring was a double bond.

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