DP Chemistry (last assessment 2024)

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Question 20N.2.hl.TZ0.2d

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.2.hl.TZ0.2d
Level hl Paper 2 Time zone TZ0
Command term Deduce, Justify Question number d Adapted from N/A
d.
[Maximum mark: 1]
20N.2.hl.TZ0.2d

Compound A is in equilibrium with compound B.

(d)

The IR spectrum of one of the compounds is shown:

COBLENTZ SOCIETY. Collection © 2018 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.

Deduce, giving a reason, the compound producing this spectrum.

[1]

Markscheme

B AND C=O absorption/1750«cm−1» 
OR
B AND absence of O–H /3200−3600«cm−1 absorption» ✔

Accept any value between 1700−1750 cm−1.

Examiners report

Many candidates identified B having C = O and a peak at 1750.

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