DP Chemistry (first assessment 2025)

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Question 21M.1A.HL.TZ1.13

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.HL.TZ1.13
Level	HL	Paper	1A	Time zone	TZ1
Command term	Determine	Question number	13	Adapted from	N/A

13.

[Maximum mark: 1]

21M.1A.HL.TZ1.13

In which series are all carbon atoms sp² hybridized?

A. C₂H₂ H₂CO HCOOH

B. C₂H₄ H₂CO HCOOH

C. C₂H₂ CO HCN

D. C₂H₆ CH₃OH CH₃OCH₃

[1]

Markscheme

B

Syllabus sections

Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.16—Hybridization is the concept of mixing atomic orbitals to form new hybrid orbitals for bonding. Analyse the hybridization and bond formation in molecules and ions. Identify the relationships between Lewis formulas, electron domains, molecular geometry and type of hybridization. Predict the geometry around an atom from its hybridization, and vice versa.