OCR A Jan 2012 Paper 2 Q8

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8 Cyclopentene is a cyclic alkene. 20 (a) The flowchart shows some reactions involving cyclopentene and cyclopentanol. Complete the partial structures in the boxes to show compounds P, Q and R, the main organic products of the reactions. OH cyclopentanol H cyclopentene K2Cr2O7(aq) / H2SO4(aq) reflux H2 with Ni catalyst compound P Br2 compound Q compound R (b) What would be the colour change in the reaction between cyclopentene and bromine?to[3] [1]OCR 2012<br />
 (c) Cyclopentene can be polymerised to give poly(cyclopentene). Draw a section of poly(cyclopentene) to show two repeat units. 21 (d) Cyclopentene reacts with HCl by electrophilic addition. Use the curly arrow model to complete the mechanism for this reaction. In your answer include any relevant dipoles, the intermediate and the product. [1] CH2 H2C CH2 Cl intermediate TURN OVER FOR QUESTION 8(e)OCR 2012 product [5] Turn over<br />
 22 (e) Chlorocyclopentane can be hydrolysed by heating with aqueous sodium hydroxide. CH2 H2C CH2 H2C CHCl NaOH CH2 H2C CH2 H2C CHOH NaCl Use the curly arrow model to complete the mechanism for this hydrolysis reaction. Include in your answer, relevant dipoles, the name of the mechanism and the type of bond fission. In your answer you should use the correct technical terms, spelled correctly. CH2 H2C CH2 H2C Cl CH2 H2C CH2 H2C CHOHHO products name of mechanismtype of bond fission[5] [Total: 15] END OF QUESTION PAPEROCR 2012<br />

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