A-LevelChemistryChemical bondingMay/June 2019Paper 1 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?

Q: What topic does this question test?

This question tests Chemical bonding in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

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

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

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Chemical bonding in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry May/June 2019 examination, Paper 1 Variant 2.

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