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An active pharmaceutical ingredient (API) was screened and found to have two known polymorphs: Form 1 and Form 2. The following data was obtained from further characterisation of both Forms using Differential Scanning calorimetry (DSC): Form 1 melting point is 167C and Hf66.8J/g Form 2 melting point is 170C and Hf74.2J/g. (i) Outline the laboratory studies carried out in a typical polymorphic screen. [6 marks] (ii) Discuss the potential impact of polymorphism on the physicochemical properties of drugs. [8 marks] (iii) Based on the data above, predict which Form is the most stable. Justify your answer. [6 marks] (iv) Are these two polymorphs monotropic or enantiotropic? Explain your reasoning. [8 marks]