OCR A Jun 2013 Paper 4 Q1 (with explained solutions) |

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OCR A Jun 2013 Paper 4 Q1

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Answer all the questions. Triglycerides are triesters and are found in fats and oils. The structure of a triglyceride found in some goats milk is shown below. (CH2)5 (CH2)4CH3 (CH2)4CH3 (a) This triglyceride is hydrolysed with hot aqueous sodium hydroxide. (i) Give the systematic name of the alcohol that is formed by this hydrolysis.[1] (ii) Draw the structures of the other organic products of this hydrolysis. [3] (b) Suggest why people who consume a large quantity of this type of goats milk might be more at risk of suffering from coronary heart disease. In your answer, you should use appropriate technical terms, spelled correctly.[2] [Total: 6]OCR 2013 Turn over<br />

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F324 Question (i) (a) (ii) propane-1,2,3-triol (cid:57) Answer Mark Scheme June 2013 Marks Guidance ALLOW absence of e after propan ALLOW 1,2,3-propanetriol ALLOW absence of hyphens 1, 2 and 3 must be clearly separated: ALLOW full stops: 1.2.3 OR spaces: 1 2 3 DO NOT ALLOW 123 IGNORE glycerol ALLOW correct structural OR displayed OR skeletal formulae OR combination of above as long as unambiguous DO NOT ALLOW cis structure One mark for decenoate salt OR decenoic acid (cid:57) One mark for hexanoate salt OR hexanoic acid (cid:57) One mark for BOTH correct products shown as salts (with or without Na+) (cid:57) ALLOW OR DO NOT ALLOW (covalent bond) one of the fatty acids is trans which may increase / cause / produce (the level of) bad/LDL cholesterol QWC cholesterol MUST be spelt correctly (b) ALLOW delocalised carboxylate IGNORE glycerol ALLOW one of the products is TRANS ALLOW reduces (the level of) good/HDL cholesterol (cid:57) (cid:57) Total<br />

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