A level_OCR_Chemistry_Paper 1_2020 | SPS F108 12.1_Carbonyl Compounds, Carboxylic Acids, Esters & Polyesters | QUESTIONS ONLY

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SPS F108 12.1_Carbonyl Compounds, Carboxylic Acids, Esters & Polyesters_A level_OCR_Chemistry_Paper 1 Carbonyl Compounds, Carboxylic Acids, Esters & Polyesters Question Paper 1 Level A Level ... Exam Board OCR Sub-Topic Time Allowed: 86 minutes Score: /71 Percentage: /100 Grade Boundaries: A* A B C D E U >85% 77.5% 70% 62.5% 57.5% 45% <45% 1 A student analysed a mixture of compounds found in red wine using gas chromatography followed by mass spectrometry (GC-MS). Two of the compounds found to be present in the mixture are shown below. CHO OCH3 compound A compound B (a) The column in the gas chromatogram is packed with solid beads coated with a liquid polymer. How does gas chromatography (GC) separate the compounds in the mixture? ................................................................................................................................................... ............................................................................................................................................. [1] (b) The mass spectrum (MS) of the first compound to emerge from the column is shown below. 100 80 60 40 20 0 25 50 75 m / z 100 125 150 (i) Identify the compound responsible for this spectrum. Give a reason for your answer. ........................................................................................................................................... ..................................................................................................................................... [1] (ii) What does your answer to (b)(i) suggest about the interaction of this compound with the phases present in the column? ........................................................................................................................................... ..................................................................................................................................... [1] (c) In red wine, compound A slowly forms an ester. The formation of the ester can also be done in the laboratory, as shown in the flowchart below. Separate portions of compound A are used in the formation of the ester. (i) Complete the boxes in the flowchart below. CHO COOH compound A CHO NaBH4 reaction 1 compound A [3] (ii) Give the mechanism to show the formation of compound C in reaction 1. Use curly arrows and relevant dipoles. (d) 1 mol of compound B reacts with 2 mol of bromine, Br2 by electrophilic substitution. OCH3 compound B Write a balanced equation for this reaction, showing clearly the structure of the organic compound. [1] [Total: 10] 2 The following three carbonyl compounds are structural isomers of C5H10O2. compound C compound D compound E (a) Describe chemical tests that you could carry out in test-tubes to distinguish between compounds C, D and E. Include appropriate reagents and any relevant observations. Also include equations showing structures for the organic compounds involved. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [4] - - - - - [Show More]

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