Set 14 Chemistry [Paper] 2

Page 1 of 7 SECTION A (60 Marks) Answer only three questions from this section . 1. An organic compound, Q contains 40% carbon, 6.67% hydrogen and the rest is being oxygen. a) Determine the simplest formula of an organic compound, Q. (03 marks) b) A solution of 28.145g of an organic compound, Q in 250g of water had a freezing point of -349ᵒC. (i) Determine the molecular formula of an organic compound, Q if cryoscopic constant, K f of water = 1.86 ᵒC/mol/kg. (03½ marks) (ii) Write structural formulae and IUPAC names of all possible isomers of an organic compound. (02 marks) c) When sodium hydrogen carbonate was added to an organic compound, Q there was no observable change. (i) Name organic compound, Q. (0½ mark) (ii) Using equations, show how an organic compound, Q is synthesized from bromomethane. (01½ marks) d) Write equation for the reaction between an organic compound, Q and water in presence of alkali catalyst and heat. (0½ mark) (ii) Outline a mechanism for the reaction in (d) (i). (02 marks) e) Name the process in (d) and state one practical application of it. (01 mark) f) By means of equations only show h ow (CH3)2CH SO3-Na+ can be formed from ethyne. (04 marks) (ii) State one practical application of the reactions in (f) (i) with each one merit and demerit of the product. (02 marks) Page 2 of 7 2. Explain what is meant by the term Partition coefficient.(02 mark s) b) Describe an experiment used to determine partition coefficient of phenol between water and methylbenzene. (05½ marks) c) State four conditions under which the partition law is valid. (02 marks) d) 50.0cm3 of 1.5M aqueous ammonia solution were shaken with 50.0cm3 of trichloromethane and the mixture left to settle to attain equilibrium at …