(a) Arrange compounds 1 to 4 in order of decreasing acidity (most acidic at the left) and justify your answer. [4 marks] 1 2 3 4 (b) Suggest suitable reagent(s) and conditions to perform the transformations (i) - (iv) below. Sometimes more than one step may be required. Consideration of stereochemistry and curved arrow mechanisms are not required. (i)