DP Chemistry (first assessment 2025)

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Question 21M.1A.HL.TZ2.40

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.HL.TZ2.40
Level	HL	Paper	1A	Time zone	TZ2
Command term	State	Question number	40	Adapted from	N/A

40.

[Maximum mark: 1]

21M.1A.HL.TZ2.40

What information can be deduced from the splitting pattern of ¹H NMR signals?

A. total number of hydrogen atoms in a compound

B. number of hydrogen atoms on adjacent atom(s)

C. functional group on which hydrogen atoms are located

D. number of hydrogen atoms in a particular chemical environment

[1]

Markscheme

B

Syllabus sections

Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.10—Proton nuclear magnetic resonance spectroscopy (1H NMR) gives information on the different chemical environments of hydrogen atoms in a molecule. Interpret 1H NMR spectra to deduce the structures of organic molecules from the number of signals, the chemical shifts, and the relative areas under signals (integration traces).