A-LevelChemistryHydrocarbonsMay/June 2019Paper 2 Q611 Marks
(a) Three alkenes, X, Y and Z, have the same molecular formula. (i) Describe what is seen when aqueous bromine is added to X. [1] X, Y and Z are reacted separately with hot, concentrated, acidified manganate(VII) ions until no further reaction occurs. The carbon-containing products are shown in the table. alkene carbon-containing products X CO2 + (CH3)2CO Y CO2 + CH3CH2CO2H Z CH3CO₂H (ii) Draw the structures of X, Y and Z. [Figure 6.1 showing empty boxes for structures X, Y and Z] [3] (iii) Deduce the molecular formula of X, Y and Z. [1] (b) The structures of V and W are shown. CH3(CH2)2CH2OH V (CH3)3COH W (i) Name the class of compound that V and W each belong to. V W [2] (ii) V and W both react with sodium metal. Write an equation for the reaction of V with sodium metal. [1] (iii) Name a reagent used to distinguish V from W. Describe any observations. reagent observations with V observations with W [3] [Total: 11]
📋 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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