DP Chemistry (first assessment 2025)

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Question 21N.1A.SL.TZ0.27

Date	November 2021	Marks available	[Maximum mark: 1]	Reference code	21N.1A.SL.TZ0.27
Level	SL	Paper	1A	Time zone	TZ0
Command term	Identify	Question number	27	Adapted from	N/A

27.

[Maximum mark: 1]

21N.1A.SL.TZ0.27

What is the general formula of alkynes?

A. C_nH_2n+2

B. C_nH_2n

C. C_nH2_n−2

D. C_nH_n

[1]

Markscheme

C

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.