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(a) When 62.8 g of an alkyl halide derivative D were dissolved in 106 g of 1-butanol, the boiling point of the mixture was 120.9 °C. Deduce and draw the structure of D, given that there are 2.5 times the number of chlorine atoms than carbon atoms in the compound. (12 marks) ( (b) One way in which the stoichiometry of a complex ion can be determined is by measuring the color intensities of solutions containing different proportions of the ligand and metal ion. In one such experiment, the maximum color intensity was observed when 5.2 cm of a 1 x 10M manganese ion solution and 1.56 cm of a 1 x 10² M solution of ethylenediamine were mixed. X Given that one mole of a compound containing the complex ion from this mixture produces three moles of silver chloride when the compound reacts with excess silver nitrate, show whether the compound is diamagnetic or paramagnetic. (8 marks)