DP Chemistry (first assessment 2025)

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Question 19N.2.HL.TZ0.12b(ii)

Date	November 2019	Marks available	[Maximum mark: 1]	Reference code	19N.2.HL.TZ0.12b(ii)
Level	HL	Paper	2	Time zone	TZ0
Command term	Deduce	Question number	b(ii)	Adapted from	N/A

b(ii).

[Maximum mark: 1]

19N.2.HL.TZ0.12b(ii)

(b(ii))

The ¹H NMR spectrum of one of the products has four signals. The integration trace shows a ratio of the areas under the signals of 9 : 3 : 2 : 2.

Deduce the structural formula of the product.

[1]

Markscheme

NOTE: Accept a skeletal formula or a full or condensed structural formula.
Penalise missing hydrogens or bond connectivities once only in Option C.

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).