Set 24 Chemistry [Paper] 2

1 SECTION A (60 Marks) Answer only three questions from this section . 1. Write equation for the reaction between the following mixtures and in each case outline the mechanism for the reaction that occurs. a) Ethanoyl chloride and phenol in presence of aqueous sodium hydroxide solution at room temperature. (03 marks) b) Propanone and the saturated solution of sodium hydrogen sulphite at room temperature. (02½ marks) c) 2-brom -2-methylpropane and hot water. (02½ marks) d) Benzene and chlorine in the presence of red hot aluminium filin gs. (04 marks) e) Cyclohexanol and hot orthophosphoric acid. (04½ marks) f) Propene and bromine water. (04½ marks) 2. Carbon, silicon, germanium, tin and lead are elements of group (IV) of the periodic table . a) Describe the reactions of: i) Carbon , silicon and lead with alkalis. (03 marks) ii) Silicon , tin and lead with hot concentrated acids. (11 marks) b) Write equations to show the following compounds can be prepared . (i).Carbon tetrachloride . (0½ mark) (ii).Lead (II) chloride . (0½mark ) c) State what would be observed and write equation for the reaction that would take place if each of the following were mixed together. i) An aqueous solution of lead (II) ethanoate and sodium iodide solution . (02½ marks) ii) Tin (II) chloride solution and iron (III) chloride solution . (02½ marks) 3. When an organic compound, T was completely bu rnt in oxygen gas, 6.72dm3 of carbon dioxide gas and 2.025g of water were formed at s.t.p. a) Calculate the empirical formula of an organic compound , T. (03 marks) b) When organic compound, T was steam distilled at a temperature of 96ᵒC and pressure of 750mmHg , the distillate was formed to contain 15.78% by mass of organic compound, T.The saturated vapour pressure of water at …