A-LevelChemistryHydrocarbonsMay/June 2015Paper 1 Q221 Mark
Four students, W, X, Y and Z, made the following statements about alkanes and alkenes. W 'Bromine reacts with alkanes by electrophilic substitution.' X 'Bromine reacts with alkenes by a free-radical addition mechanism.' Y 'Alkenes can be oxidised by acidified manganate(VII) ions.' Z 'Alkenes are formed from alkanes by cracking.' Which two students are correct?
AW and X
BW and Z
CX and Y
DY and Z
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of hydrocarbons within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
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