DP Chemistry (first assessment 2025)

Question 19M.2.HL.TZ1.b

Date	May 2019	Marks available	[Maximum mark: 1]	Reference code	19M.2.HL.TZ1.b
Level	HL	Paper	2	Time zone	TZ1
Command term	Draw	Question number	b	Adapted from	N/A

[Maximum mark: 1]

19M.2.HL.TZ1.b

Draw the structure of one other isomer of xylene which retains the benzene ring.

[1]

Markscheme

[✔]

Examiners report

Generally well done, although some candidates repeated the formula of the 1,4-isomer structure or drew the wrong bond, e.g. benzene ring to H rather than C on CH₃.

Syllabus sections

Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.6—Structural isomers are molecules that have the same molecular formula but different connectivities. Recognize isomers, including branched, straight-chain, position and functional group isomers.

Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.12—Benzene, C6H6, is an important example of a molecule that has resonance. Discuss the structure of benzene from physical and chemical evidence.

Question 19M.2.HL.TZ1.b

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