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CIE Jun 2016 v3 Paper 4 Q9
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![The anti-inflammatory drug ketoprofen can be synthesised from benzene via the following five steps. 14 PMT step 1 step 4 step 2 Br T, (C15H14O) step 3 step 5 CO2H ketoprofen (a) Suggest the structures of compounds T and U and draw them in the boxes above. [2] (b) Suggest reagents and conditions for steps 1-5. step 1step 2step 3step 4step 5[5] (c) What types of reaction are steps 1 and 5? step 1step 5[2] [Total: 9]UCLES 2016 9701/43/M/J/16<br />](https://learnah.org/wp-content/uploads/2018/08/June_2016_v3_QP_-_Paper_4_CIE_Chemistry_A-level_9.jpg)
![Page 7 Mark Scheme Syllabus Paper Cambridge International AS/A LevelMay/June 2016 9701 43 Question Answer Marks PMT (ii) in a complex the dorbitals are split into 2 energy levels colour is due to absorption of light (in visible region) electron promotion to higher orbital absorbs a photon the dd energy gap is different for the two complexes, hence different colours (a) T is U is CN (b) step 1: C6H5COCl + AlCl 3 (+ heat) step 2: CH3CH2Cl + AlCl 3 (+ heat) step 3: Br2 + light (or heat) step 4: KCN + heat (in ethanol) step 5: H3O OR H in H2O OR HCl (aq) etc AND heat / boil / reflux (c) step 1: electrophilic substitution OR nucleophilic substitution step 5: hydrolysis OR nucleophilic substitution 10 (a) n(MnO4 = 0.0215.2 / 1000 = 3.04105 / 2 = 7.610 4 4 mol (in 25 cm 4 n(C2O4H2) = 3.0410 ) = 3.0410 3 mol in 100 cm Mr = 24 + 64 + 2 = 90 mass of C2O4H2 = 3.0410 = 0.2736 g (0.274) 390 percentage = 0.2736100/40 = 0.68% (b) (i) SOCl 2 or PCl 5 or PClCambridge International Examinations 2016 [1] [1] [1] [1] [Total: 7] [1] [1] [1] [1] [1] [1] [1] [1] [1] [Total: 9] [1] [1] [1] [1]<br />](https://learnah.org/wp-content/uploads/2018/08/June_2016_v3_MS_-_Paper_4_CIE_Chemistry_A-level_9.jpg)