11 Basic Concepts Assessment questins

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1 The following compounds A–H include hydrocarbons and compounds containing oxygen. a Define the term hydrocarbon. (1 mark) b Which of the compounds A–H are unsaturated? (1 mark) c Which of ... the compounds A–H can be described as branched and aliphatic? (1 mark) d i Name compound C. (1 mark) d ii Give the empirical formula of compound C. (1 mark) e i Compounds F and G contain the same functional group. In which homologous series do both of these molecules belong? (1 mark) © Oxford University Press 2015 www.oxfordsecondary.co.uk/acknowledgements This resource sheet may have been changed from the original 1 This study source was downloaded by 100000830772748 from CourseHero.com on 05-11-2022 23:52:33 GMT -05:00 https://www.coursehero.com/file/72614724/11-Basic-Concepts-Assessmentdoc/ 11 Basic concepts of organic chemistry Exam-style questions OCR Chemistry A e ii Deduce the general formula for compounds F and G. (1 mark) f Give the molecular formula of compound H. (1 mark) g Are compounds A and B structural isomers? Explain your answer. (1 mark) 2 There are three types of organic mechanism: addition, substitution and elimination. a Which type of organic mechanism will always have an atom economy of 100%? Explain your answer. (1 mark) b Classify each of the following reactions as either addition, substitution or elimination: i CH3CHBrCH3  NaOH → CH3CH(OH)CH3  NaBr (1 mark) ii CH3CHBrCH3  NaOH → CH2CHCH3  NaBr  H2O (1 mark) iii Name the homologous series that the organic product from the reaction in b ii belongs to. (1 mark) iv Draw the skeletal formula of the structural isomer of the organic product in b ii and name it. (2 marks) © Oxford University Press 2015 www.oxfordsecondary.co.uk/acknowledgements This resource sheet may have been changed from the original 2 This study source was downloaded by 100000830772748 from CourseHero.com on 05-11-2022 23:52:33 GMT -05:00 https://www.coursehero.com/file/72614724/11-Basic-Concepts-Assessmentdoc/ 11 Basic concepts of organic chemistry Exam-style questions OCR Chemistry A 3 Depending on the conditions used, the C–Br bond in the compound below can break either homolytically or heterolytically. a i When UV light is used, the C–Br bond fission is homolytic. Describe what happens to the bonding electrons when the C–Br bond undergoes homolytic fission. (1 mark) ii When the C–Br bond breaks homolytically, what name is given to the type of particle produced? (1 mark) b i Name the type of particle produced when the C–Br bond breaks heterolytically. (1 mark) ii Use curly arrows and partial charges to show the breaking of the C–Br bond via heterolytic fission on the molecule drawn below. (2 marks) iii What does a curly arrow represent? (1 mark) 4 Butanoic acid, shown below, is the chemical responsible for the distinctive smell of human vomit. a i Give the molecular formula of butanoic acid. (1 mark) ii State the homologous series in which butanoic acid belongs. (1 mark) © Oxford University Press 2015 www.oxfordsecondary.co.uk/acknowledgements This resource sheet may have been changed from the original 3 This study source was downloaded by 100000830772748 from CourseHero.com on 05-11-2022 23:52:33 GMT -05:00 https://www.coursehero.com/file/72614724/11-Basic-Concepts-Assessmentdoc/ 11 Basic concepts of organic chemistry Exam-style questions OCR Chemistry A b Butanoic acid is mainly used to prepare methyl butanoate, which is used in perfumes as its fruity smell resembles that of pineapples. The equation for this reaction is shown below: CH3CH2CH2CO2H  CH3OH → CH3CH2CH2CO2CH3  ? Reaction 4.1 i Deduce the other product made in this reaction. (1 mark) ii State the homologous series in which methyl butanoate belongs and draw the skeletal formula of this molecule. (2 marks) iii Suggest why methyl butanoate has a comparatively low boiling point when compared to either of the reactants in Reaction 4.1 above. (2 marks) iv Suggest a reason, other than cost, why a perfume manufacturer would choose to use the chemically manufactured pineapple fragrance rather than the natural product. (1 mark) v After methyl butanoate has been produced via Reaction 4.1, it needs to be purified. This is achieved by adding sodium carbonate. Suggest the type of impurity removed when sodium carbonate is added and how you would know when all of this impurity has been removed from the product. (2 marks) © Oxford University Press 2015 www.oxfordsecondary.co.uk/acknowledgements This resource sheet may have been changed from the original 4 This study source was downloaded by 100000830772748 from CourseHero.com on 05-11-2022 23:52:33 GMT -05:00 https://www.coursehero.com/file/72614724/11-Basic-Concepts-Assessmentdoc/ 11 Basic concepts of organic chemistry Exam-style questions OCR Chemistry A 5 An organic compound, known to be a carbonyl, was analysed and found to contain 66.7% carbon, 11.1% hydrogen and 22.2% oxygen by mass. Its molecular mass was determined to be 72. a Calculate the empirical formula. (2 marks) b Determine the molecular formula. (1 mark) c Draw and name all possible structures of this compound. (6 marks) © [Show More]

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