A-LevelChemistryChemical bondingMay/June 2012Paper 1 Q101 Mark
Which molecule has the largest overall dipole?
A[Diagram of propyne (H-C≡C-CH3)]
B[Diagram of propanone (CH3-C(=O)-CH3)]
C[Diagram of 1,2-dichloro-1-propene (Cl-C=C(CH3)-Cl with H also on first C)]
D[Diagram of 2,3-dichloro-2-butene (H3C-C(Cl)=C(Cl)-CH3)]
✓ Correct Answer
The correct answer is B: [Diagram of propanone (CH3-C(=O)-CH3)]
📋 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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