Edexcel Jun 2009 Paper 3 Q3 (with explained solutions) |

Skip to content

Edexcel Jun 2009 Paper 3 Q3

Answers available below

PMT 3 An organic compound A has the structure shown below. H H H H H C C C C O H H (a) Give the observations that you would expect to make when each of the tests below is carried out. Give a brief chemical explanation of each reaction that occurs. Mechanisms are not required. (i) A small amount of phosphorus(V) chloride is added to 2 cm3 of A in a test tube. (2) ObservationExplanation(ii) A few drops of potassium manganate(VII) solution and 2 cm3 of dilute sulfuric acid are added to 2 cm3 of A in a test tube and the mixture is gently warmed. (2) ObservationExplanation(iii) A few drops of bromine water are added to 2 cm3 of A in a test tube and the mixture is shaken. (2) ObservationExplanation*N34473A0816*<br />
PMT (b) In the box below, draw the displayed formula of the product formed in (a)(iii). (1) (Total for Question 3 = 7 marks) *N34473A0916* Turn over<br />

Show answer

Correct Answer Reject Observation: Steamy/misty /white fumes (1) Explanation: Hydrogen chloride / HCl formed OR chloroalkene / chloro- compound formed OR Substitution reaction with OH (1) Smoke or solid Hydrochloric acid Chloroalkane Just OH / alcohol group reacts (with PCl5) Correct Answer Reject Just decolourized Reacts alone instead of addition or oxidation Due to the presence of C=C /alkene / OH A oxidised Observation: Purple to colourless or brown (1) Explanation: Addition to C=C /alkene OR oxidation of C=C /alkene OR OH / alcohol group oxidised (1) Accept Reacts with C=C to form diol or with OH to form an aldehyde or a carboxylic acid OR manganate(VII) / permanganate / MnO4 Mn2+ (if decolourized)to MnO2 (if brown) or Mn(II) / Correct Answer Reject Observation: Orange or yellow or brown (accept red-brown) to colourless (1) Explanation: (Bromine) addition to C=C /alkene (Bromine) reacts with C=C /alkene to form dibromoalkanol / dibromo compound (1) pink instead of purple clear instead of colourless Just decolourized Reaction alone instead of addition dibromoalkane Mark Mark Mark Question Number 3 (a)(i) Question Number 3 (a)(ii) Question Number 3 (a)(iii)<br />
Question Number 3 (b) Correct Answer Br Br Br OR Br Accept Reject C O Mark Accept OH for OH Question Number 4 (a) Correct Answer Reject Funnel with neck & tap (1) IGNORE stopper Organic layer above aqueous layer (1) Stand alone See diagrams Conical /filter / Buchner funnel with tap Funnel too full to be stoppered Mark YES NO<br />

Question 1 2 3 4

About us | Need Help? | Feedback

Proudly powered by WordPress | Theme: Sydney by aThemes.