DP Chemistry (first assessment 2025)

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Question 21M.2.HL.TZ1.5b

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.2.HL.TZ1.5b
Level	HL	Paper	2	Time zone	TZ1
Command term	Justify	Question number	b	Adapted from	N/A

b.

[Maximum mark: 1]

21M.2.HL.TZ1.5b

(b)

Justify why ethene has only a single signal in its ¹H NMR spectrum.

[1]

Markscheme

hydrogen atoms/protons in same chemical environment ✔

Accept “all H atoms/protons are equivalent”.
Accept “symmetrical”

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).