DP Chemistry (last assessment 2024)

Question 20N.2.sl.TZ0.b

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

[Maximum mark: 1]

20N.2.sl.TZ0.b

Compound A is in equilibrium with compound B.

The IR spectrum of one of the compounds is shown:

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 $1700 - 1750 c m^{- 1}$ .

Examiners report

About 50% of the candidates answered correctly. Quite a few, however, gave compounds other than A or B, indicating not reading the question properly or being confused by the skeletal formulas given in the question.

Syllabus sections

Core

Core » Topic 11: Measurement and data processing » 11.3 Spectroscopic identification of organic compounds

Core » Topic 10: Organic chemistry » 10.1 Fundamentals of organic chemistry

Core » Topic 10: Organic chemistry

Core » Topic 11: Measurement and data processing

Question 20N.2.sl.TZ0.b

Select a Test

Syllabus sections

Confirm action