DP Chemistry (first assessment 2025)

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Question 19N.1A.SL.TZ0.25

Date	November 2019	Marks available	[Maximum mark: 1]	Reference code	19N.1A.SL.TZ0.25
Level	SL	Paper	1A	Time zone	TZ0
Command term	Identify	Question number	25	Adapted from	N/A

25.

[Maximum mark: 1]

19N.1A.SL.TZ0.25

Which compound is not in the same homologous series as the others?

A. C₅H₁₂

B. C₆H₁₂

C. C₇H₁₆

D. C₈H₁₈

[1]

Markscheme

B

Syllabus sections

Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.3—A homologous series is a family of compounds in which successive members differ by a common structural unit, typically CH2. Each homologous series can be described by a general formula. Identify the following homologous series: alkanes, alkenes, alkynes, halogenoalkanes, alcohols, aldehydes, ketones, carboxylic acids, ethers, amines, amides and esters.