18. 19. Study the flow chart below and answer the questions that follow:- (i) Give the name of the substance CH = CH (ii) To which group of hydrocarbons does the substance in (i) above belong? (iii) Give two reagents that can be used to prepare the substance named in (i) above (iv) State two physical properties of the substances in (i) above (v) Give the names to the process in step I and 2 (vi) Write an equation to show how substance A is formed (iv) Identify substance B The diagram below represents a large-scale fractional distillation plant used to separate the components A, B, C and D in a mixture mixture A (20C - 50C) B (150C - 200C) B (200C 300C) D (300C 350C) (a) The components have the following average relative molecular masses not necessarily in that order; 282, 184, 44 and 128. (a) (i) What is the physical state of B at the position marked Q? (ii) Which component has an average relative molecular mass of 128? Explain (iii) State with a reason whether C is pure or impure (iv) Explain how the mixture is separated into its components (v) Name two naturally occurring mixtures that are separated using this process