DP Chemistry (first assessment 2025)

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Question 21M.1A.SL.TZ1.24

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.SL.TZ1.24
Level	SL	Paper	1A	Time zone	TZ1
Command term	Predict	Question number	24	Adapted from	N/A

24.

[Maximum mark: 1]

21M.1A.SL.TZ1.24

Which series is in order of increasing boiling point?

A. CH₂CH₂CH₃OH CH₃COCH₃ CH₃CH₂CH₃

B. CH₃CH₂CH₃ CH₃COCH₃ CH₂CH₂CH₃OH

C. CH₃COCH₃ CH₂CH₂CH₃OH CH₃CH₂CH₃

D. CH₃CH₂CH₃ CH₂CH₂CH₃OH CH₃COCH₃

[1]

Markscheme

B

Syllabus sections

Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.9—Given comparable molar mass, the relative strengths of intermolecular forces are generally: London (dispersion) forces < dipole–dipole forces < hydrogen bonding. Explain the physical properties of covalent substances to include volatility, electrical conductivity and solubility in terms of their structure.