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Reattempt 3 questions from Organic Chemistry where you lost marks for incomplete mechanisms.
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Question
Explain the hybridisation in methane molecule (CH₄).
Mistake: Missed mention of tetrahedral geometry and bond angle.
Revision tip
When revising, underline where hybridisation is defined, and where geometry is described.
Answer feedback
Score: 6 / 10
You correctly stated that methane uses sp³ hybrid orbitals and forms four equivalent C–H bonds.
You lost marks for not explaining how the 2s and three 2p orbitals mix and for skipping the tetrahedral geometry with 109.5° bond angles.
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Simulated feedback
Good start – you mentioned hybridisation but the explanation is incomplete.
What you did well
- • Identified that methane forms four single covalent bonds.
- • Mentioned sp³ hybridisation of carbon.
Where you lost marks
- • Didn't explain how one 2s and three 2p orbitals mix to form sp³ orbitals.
- • Skipped mentioning tetrahedral geometry with 109.5° bond angles.
How to fix this next time
Add 2–3 lines describing orbital mixing and explicitly state the geometry and bond angle. This can easily convert a 6 into a 9 or 10.
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