OCR 2023 Chemistry A H432/02: Synthesis and analytical techniques A Level Question Paper & Mark Scheme (Merged)

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. 1 Which compound is used for proton exchange in NMR spectroscopy? A CCl 4 B CDCl 3 C D2O D Si(CH3 ) 4 Your answer [1] 2 Which compound reacts with 2,4-dinitrophenylhydrazine but does not react with Tollens’ reagent? A C6H5COCOOH B C6H5CH(OH)CHO C CH3COCHO D CH3CH2CH(OH)CH3 Your answer [1] 3 Propyne, CH3C≡CH, is a member of the alkynes homologous series with the C≡C functional group. What is the general formula of the alkynes? A CnH2n–4 B CnH2n–2 C CnH2n D CnH2n+2 Your answer [1] 3 OCR 2023 Turn over HO N HN 4 The structure of the painkiller paracetamol is shown below. OH O N H Paracetamol Which functional groups are present in paracetamol? A alcohol, amide B alcohol, arene, ketone, amine C phenol, amide D phenol, ketone, amine Your answer [1] 5 Oxymetazoline, shown below, is used as a decongestant in the treatment of colds. Oxymetazoline How many H atoms are in one molecule of oxymetazoline? A 23 B 24 C 25 D 26 Your answer