DP Chemistry (first assessment 2025)

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Question 20N.1A.SL.TZ0.26

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.SL.TZ0.26
Level	SL	Paper	1A	Time zone	TZ0
Command term	Apply	Question number	26	Adapted from	N/A

26.

[Maximum mark: 1]

20N.1A.SL.TZ0.26

What is the IUPAC name of this molecule?

A. 1,1,2,4-tetramethylpent-1-ene

B. 2,4,5-trimethylhex-4-ene

C. 2,4,5,5-tetramethylpent-4-ene

D. 2,3,5-trimethylhex-2-ene

[1]

Markscheme

D

Examiners report

It was good to see that 2/3 of candidates could pick a preferred IUPAC name from a skeletal structure.

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.