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(b) Devise a synthesis of the heterocyclic compound 5 from starting materials each containing no more than six carbon atoms. In your answer you should use retrosynthetic analysis to justify your choice of approach. [10 marks] Answer all parts. (a) Provide suitable reagent(s) to perform the transformations (i) - (iii) below, considering the stereochemistry of the products where relevant (curved arrow mechanisms are not required). [6 marks] (i) \begin{tabular}{l} Reagent(s)? \\ Note: a racemic product is acceptable \\ \hline \end{tabular} (ii) Reagent(s)? (iii)