DP Chemistry (first assessment 2025)

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Question 21N.1A.SL.TZ0.25

Date	November 2021	Marks available	[Maximum mark: 1]	Reference code	21N.1A.SL.TZ0.25
Level	SL	Paper	1A	Time zone	TZ0
Command term	Apply	Question number	25	Adapted from	N/A

25.

[Maximum mark: 1]

21N.1A.SL.TZ0.25

What is the name of this substance using IUPAC rules?

A. 2-ethyl-1-methylbutan-1-ol

B. 1-methyl-2-ethylbutan-1-ol

C. 3-ethylpentan-2-ol

D. 3-ethylpentan-4-ol

[1]

Markscheme

C

Syllabus sections

Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.5—“IUPAC nomenclature” refers to a set of rules used by the International Union of Pure and Applied Chemistry to apply systematic names to organic and inorganic compounds. Apply IUPAC nomenclature to saturated or mono-unsaturated compounds that have up to six carbon atoms in the parent chain and contain one type of the following functional groups: halogeno, hydroxyl, carbonyl, carboxyl.