Ocr a level chemistry synthesis and analytical techniques latest 2023

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2 © OCR 2023 SECTION A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. Answer all the questions. 1 2-Methylbutane is reacted wi... th chlorine by radical substitution. What is the number of structural isomers with the molecular formula C 5H11Cl that could be formed? A 2 B 3 C 4 D 5 Your answer [1] 2 Which type(s) of stereoisomerism is/are shown by 2,4-dimethylhex-2-ene? A E/Z isomerism only. B Optical isomerism only. C Both E/Z isomerism and optical isomerism. D Neither E/Z isomerism nor optical isomerism. Your answer [1] 3 Which sample contains the greatest number of carbon atoms? A 20.0g C6H5OH B 30.0g C2H5COOH C 40.0g CH3CHO D 50.0g CH3OH Your answer [1]3 © OCR 2023 Turn over 4 What is the correct equation for the incomplete combustion of butan-1-ol? A CH 3CH2CH2CH2OH + 1½O2 4CO + 5H2 B CH 3CH2CH2CH2OH + 2O2 4CO + 5H2 C CH 3CH2CH2CH2OH + 4O2 4CO + 5H2O D CH 3CH2CH2CH2OH + 4½O2 4CO + 5H2O Your answer [1] 5 2-Methylcyclopentanone, shown below, is reacted with NaCN(aq)/H+(aq) to form an organic product. O CH 3 2-methylcyclopentanone Which statement is correct? A In the mechanism, a CN– ion accepts an electron pair. B The mechanism is electrophilic additi [Show More]

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