| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.hl.TZ2.14 |
| Level | HL | Paper | 1 | Time zone | TZ2 |
| Command term | Identify | Question number | 14 | Adapted from | N/A |
Question
Which of the following best describes the formation of \(\pi \) bonds?
A. They are formed by the sideways overlap of parallel orbitals.
B. They are formed by the axial overlap of orbitals.
C. They are formed by the sideways overlap of an s and p orbital.
D. They are formed by the axial overlap of either s or p orbitals.
Markscheme
A
Examiners report
Two respondents suggested that the terms axial and sideways overlap are confusing. However, these terms are also clearly mentioned in the teachers note corresponding to as 14.2.1 and have also been used previously on examination papers.
Syllabus sections
Additional higher level (AHL) » Topic 14: Chemical bonding and structure » 14.1 Covalent bonding and electron domain and molecular geometries
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