A-LevelChemistryChemical bonding9701/12 · May/June 2019 · Q41 Mark

A σ bond is made between two carbon atoms in a molecule of ethene. Which diagram shows the orbital overlap that occurs to form this bond?

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ATwo p-orbitals overlapping in a side-on fashion.

BTwo hybrid orbitals, each with a large lobe and a very small back-lobe, overlapping end-on.

CTwo orbitals, each with a large lobe and a smaller back-lobe, overlapping end-on along the internuclear axis.

DTwo p-orbitals overlapping end-on along the internuclear axis.

✓ Correct answer

C: Two orbitals, each with a large lobe and a smaller back-lobe, overlapping end-on along the internuclear axis.

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Topic: Chemical bonding, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2019 Paper 1 Variant 2, question 4.

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